We provide ray optics and optical instruments practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on ray optics and optical instruments skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.

#### List of ray optics and optical instruments Questions

Question No | Questions | Class |
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1 | An object is placed at a distance of 1.5 ( mathrm{m} ) from a screen and a convex lens is interposed between them. The magnification produced is 4. The focal length of the lens is then ( A cdot 1 m ) B. 0.5 ( m ) c. ( 0.24 mathrm{m} ) D. ( 2 mathrm{m} ) | 12 |

2 | The intermediate image formed by the objective of a compound microscope is: A. real, inverted and magnified B. real, erect and magnifiedd c. virtual, erect and magnified D. virtual, inverted and magnified | 12 |

3 | An object is kept at ( 15 mathrm{cm} ) from a convex mirror of focal length ( 25 mathrm{cm} . ) What is the magnification? A ( cdot 4 / 9 ) B. 5/8 ( c cdot 9 / 4 ) D. 8/5 | 12 |

4 | A ray of light is normally incident on one face of an equilateral glass prism. What will be the angle of incidence at the second face of the prism? A ( cdot 0^{circ} ) B . ( 30^{circ} ) ( c cdot 60^{circ} ) D. ( 90^{circ} ) | 12 |

5 | A ray deviates at ( 90^{circ} ) after suffering reflection from a mirror. The angle of incidence is: A ( cdot 90^{circ} ) B. 30 ( c cdot 60 ) ( D cdot 45 ) | 12 |

6 | The focal length of a convex mirror is its radius of curvature. A. equal to B. half of c. two times D. negative of | 12 |

7 | The plano-convex lens of focal length 20 ( mathrm{cm} ) and ( 30 mathrm{cm} ) are placed together to form a double convex lens, the final focal length will be : ( mathbf{A} cdot 12 mathrm{cm} ) B. ( 60 mathrm{cm} ) ( mathbf{c} cdot 20 c m ) D. ( 30 mathrm{cm} ) | 12 |

8 | A convex lens forms a real image ( 4 mathrm{cm} ) long on a screen.When the lens is shifted to a new position without disturbing the object or the screen, again real image is formed on the screen which is ( 16 mathrm{cm} ) long. The length of the object is : A. ( 8 mathrm{cm} ) B. 10 ( mathrm{cm} ) c. ( 12 mathrm{cm} ) D. ( 6 mathrm{cm} ) | 12 |

9 | Explain total internal reflection using diagram. | 12 |

10 | How many types of prism are possible ( A ) B. 2 ( c cdot 3 ) D. ( infty ) | 12 |

11 | An object is kept at a distance of ( 20 mathrm{cm} ) from a converging lens of focal length 10cm. What will be the magnification? A ( cdot frac{1}{2} ) B. c. 2 D. | 12 |

12 | represents the passage of white light through a prism? ( A ) 3 ( c ) ( D ) | 12 |

13 | One cannot see through fog because A. Fog absorbs light B. Refractive index of fog is unity C. Light suffers total internal reflection at the droplets in fog D. Light is scattered by the droplets in fog | 12 |

14 | For how long (approximate value) does the image remain on the retina? A . ( 1 s ) B. ( 0.5 s ) c. ( 0.12 s ) D. ( 0.06 s ) | 12 |

15 | If the absolute refractive indices of glass and water are ( frac{3}{2} ) and ( frac{4}{3} ) respectively, what will be the velocity of light in water? (If velocity of light in glass ( left.=2 times 10^{8}right) ) ( mathbf{A} cdot 2.25 times 10^{8} m / s ) B . ( 3.25 times 10^{8} m / s ) C ( .2 .25 times 10^{7} mathrm{m} / mathrm{s} ) D. ( 2.15 times 10^{8} mathrm{m} / mathrm{s} ) | 12 |

16 | The angle between reflected ray and the is called angle of reflection A. normal B. incident ray c. reflecting surface D. none of the above | 12 |

17 | The magnification of plane mirror is always – ( mathbf{A} cdot1 ) ( c .=1 ) D. zero | 12 |

18 | A 27 mw laser beam has a cross- sectional area of ( 10 mathrm{mm}^{2} ). The magnitude of the maximum electric field in this electromagnetic wave is given by?[Given permittivity of space ( €_{0} ) ( =9 times 10^{-12} mathrm{Sl} ) units, Speed of light ( c= ) ( left.3 times 10^{8} m / sright] ) A. ( 1 mathrm{kV} / mathrm{m} ) B. 2 kv/m c. ( 1.4 mathrm{kV} / mathrm{m} ) D. ( 0.7 mathrm{kV} / mathrm{m} ) | 12 |

19 | ( mathbf{A} ) ( 2.0 mathrm{cm} ) long object is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror is ( 30 mathrm{cm}, ) and its image is formed ( 60 mathrm{cm} ) from the mirror on the same side of the mirror as the object. Find the height of the image formed: A. 3 cm в. 4 ст ( c .5 mathrm{cm} ) D. ( 8 mathrm{cm} ) | 12 |

20 | The pupil of the eye changes its size to adjust for A. objects at different distances B. different amount of light c. objects of different sizes D. different colours | 12 |

21 | Which of the following principles has been followed to propagate light waves through an optical fibre? A. Difraction B. Interference c. Total internal reflection D. Scattering | 12 |

22 | How may times total internal reflection occurs in the drop for formation of primary and secondary rainbows? | 12 |

23 | Explain the manner in which light travels with the help of an activity. | 12 |

24 | Two lens of focal length ( f_{1} ) and ( f_{2} ) are kept in contact coaxially. The resultant power of combination will be A. ( frac{f_{1} f_{2}}{f_{1}-f_{2}} ) в. ( frac{f_{1}+f_{2}}{f_{1} f_{2}} ) c. ( f_{1}+f_{2} ) D. ( frac{f_{1}}{f_{2}}+frac{f_{2}}{f_{1}} ) | 12 |

25 | A monochromatic ray of light falls on a regular prism. What is the relation between angle of incidence and angle of emergence in the case of minimum deviation? | 12 |

26 | A concave mirror has a radius of curvature ( 2 mathrm{m} . ) The light from a distance source is incident on the mirror. The distance of the image of the source from the mirror is: ( mathbf{A} cdot 0.5 m ) B. ( 1 m ) c. ( 1.5 m ) D. ( 2 m ) | 12 |

27 | The refracting angle of a prism is ( A ). The refractive index of the prism is ( cot frac{A}{2} ) Find angle of minimum deviation. ( mathbf{A} cdot 180^{circ}+2 A ) B ( cdot 180^{circ}-3 A ) D. ( 90^{circ}-A ) | 12 |

28 | Explain, why white light is dispersed when passing through a prism. | 12 |

29 | A ray of monochromatic light in incident on one refracting face of a prism of angle ( 75^{circ} . ) If passes through the prism and is incident on the other face at the critical angle. If refactive index of the material of the prism is ( sqrt{2} ) the angle of incidence on the first face of the prism is A ( cdot 30^{circ} ) B . ( 45^{circ} ) ( c cdot 60^{circ} ) D. ( 0^{circ} ) | 12 |

30 | A ray of light from a liquid ( (mu=sqrt{3}) ) is incident on a system of two right angled prism of refractive indices ( sqrt{3} a n d sqrt{2} ) as shown in the figure. The light suffers zero net deviation when it emerges into air from surface CD. If the angle of incidence (in degrees) is ( 5 n . ) Find ( n ) ? | 12 |

31 | White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact. What will be seen on the screen? A. Violet will appear where red was B. The spectrum will remain the same c. There will be no spectrum, but only the original light with no deviation. D. There will be no spectrum, but the original light will be laterally displaced | 12 |

32 | The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is ( 80 mathrm{cm}, ) at what distance should the candle be placed from the lens? ( mathbf{A} cdot 50 mathrm{cm} ) B. ( -36.67 mathrm{cm} ) ( mathbf{c} .-26.67 mathrm{cm} ) D. ( 80 mathrm{cm} ) | 12 |

33 | Monochromatic light passes through a prism. Compares to that in air, inside the prism the light’s. A. Speed and wavelength are different but frequency remains same B. Speed and frequency are different but wavelength remains same c. Frequency and wavelength are different but speed remains same D. speed, wavelength and frequency are all different | 12 |

34 | In the minimum deviation position of a prism, the refracted ray is always parallel to its base. A. True B. False | 12 |

35 | In an experiment to determine the focal length ( (f) ) of a concave mirror by the ( u-v ) method, a student places the object pin ( A ) on the principal axis at a distance ( x ) from the pole ( P . ) The student looks at the pin and its inverted image from a distance keeping the eye in line with ( P A . ) When the student shifts the eye towards left, the image appears to the right of the object pin. Then: A. ( x<f ) B. ( f<x2 f ) | 12 |

36 | Fig. 16.10 shows the word REST written in two ways in front of a mirror. Show how the word would appear in the mirror. The | 12 |

37 | With regard to an astronomical telescope for refracting type, state how you will increase its: (i) magnifying power. (ii) resolving power | 12 |

38 | Is the color of emergent beam ( X ) white ight: A. True B. False | 12 |

39 | To produce a minimum reflection of wavelengths near the middle of visible spectrum (550nm), how thick should a coating of ( M g F_{2}(mu=1.38) ) be vacuum-coated on a glass surface? A ( cdot 10^{-7} ) B ( cdot 10^{-10} ) ( mathbf{c} cdot 10^{-9} m ) D. ( 10^{-8} m ) | 12 |

40 | A light ray falls on the air glass interface at an angle of ( 30^{circ} . ) What is the angle of refraction for this rays? ( left(n_{a g}=frac{3}{2}right) ) | 12 |

41 | A ray of light is incident on a hollow glass prism as shown. Then the ray will undergo: A. deviation and dispersion both B. deviation but not dispersion c. dispersion but no deviation D. neither deviation nor dispersion | 12 |

42 | A man who is ( 1.40 mathrm{m} ) tall stands in front of a mirror and can just see himself from head to top. Assuming that his eyes are ( 0.14 mathrm{m} ) below the top of his head, the minimum height of the mirror is: ( A cdot 1.4 mathrm{m} ) B. ( 1.26 mathrm{m} ) c. ( 0.70 mathrm{m} ) D. 0.63 ( m ) | 12 |

43 | What is the reason behind the shinning of diamonds and how do you appreciate it? | 12 |

44 | When light is refracted from a surface, which of its following physical parameters does not change? A. Velocity B. Amplitude c. Frequency D. wavelength | 12 |

45 | Two plane mirrors are placed as shown in the figure and point object ‘O’ is placed at the origin. Flnd how many images will be formed | 12 |

46 | The type of lens used as a simple microscope. A. Binocular lens B. Plano concave lens c. concave convex lens D. Convex lens | 12 |

47 | Two identical equiconcex lenses made of glass of refractive index ( 1.5, ) placd in contact has power P. When a liquid of refractive index ( mu ) is filled in the gap between the lenses, the power becomes ( boldsymbol{P} ) ( overline{mathbf{3}} ) ( i f mu=frac{x}{3} . ) Find the value of ( x ) | 12 |

48 | A planet is observed by an astronomical reflecting telescope having an objective of focal length ( 16 m ) and an eye-piece of focal length 2cm. Then: This question has multiple correct options A. the distance between the objective and the eye – piece is ( 16.02 m ) B. the angular magnification of the planet is 800 c. the image of planet is erect D. the objective is larger than eye – piece | 12 |

49 | A rod of length ( 10 mathrm{cm} ) lies along the principal axis of concave mirror of focal length ( 10 c m ) in such a way that its end closer to the pole is ( 20 mathrm{cm} ) away from the mirror. The length of the image is- ( mathbf{A} cdot 15 mathrm{cm} ) B. ( 2.5 mathrm{cm} ) ( c .5 mathrm{cm} ) D. ( 10 mathrm{cm} ) | 12 |

50 | A point object is placed on the principal axis of the convex lens of focal length ( 20 mathrm{cm} ) at a distance ( 40 mathrm{cm} ) to the left on it. The diameter of the lens is ( 10 mathrm{cm} ). If the eye is placed 60cm to the right of the lens at a distance h below the principal axis, then max value of ‘h’ to see the image is A . ( 1.5 mathrm{cm} ) B. 2.5 ( mathrm{cm} ) c. ( 3 mathrm{cm} ) D. ( 5 mathrm{cm} ) | 12 |

51 | Figures shows a convex lens cut symmetrically into two equal halves and separated laterally by a distance h. A point object placed at a distance 30 ( mathrm{cm}, ) from the lens halves, forms two real images separated by a distance d. A plot of d versus h is shown in figure. The focal length of the lens is A. 35 cm B. ( 40 mathrm{cm} ) ( c .45 mathrm{cm} ) D. ( 60 mathrm{cm} ) | 12 |

52 | A glass prism of refractive index 1.5 is placed in water of refractive index 1.33 The minimum value of the angle of the prism so that it will not be possible to have any emergent ray is : A ( .150^{circ} ) B . ( 125^{circ} ) ( c cdot 165 ) D. ( 180^{circ} ) | 12 |

53 | Which one is as incorrect match? A. Myopia – Biconvex lens B. Olfactory – Smell C. Algerireceptor – Pain D. Organ of corti cells – Sensory and supporting | 12 |

54 | Find the focal length of a lens of power (-2.0)D. What type of lens is this? | 12 |

55 | State what is meant by refraction of light. State Snell’s law for refraction of light and also express it mathematically. The refractive index of air with respect to glass is ( 2 / 3 ) and the refractive index of water with respect to air is ( 4 / 3 . ) If the speed of light in glass is ( 2 times 10^{8} mathrm{m} / mathrm{s} ) find the speed of light in (a) air, (b) water | 12 |

56 | Explain the phenomenon of total internal reflection of light with an example. Draw necessary ray of diagram. | 12 |

57 | Rays parallel to the principle axis are refracted by the lens through the point: A . B. 2F ( c cdot F ) D. None | 12 |

58 | A biconvex lens is made of material of refractive index 1.5 each of radius of curvature of lens surface is ( 20 mathrm{cm} ). The focal length of lens is: A. ( 20 mathrm{cm} ) B. 10 ( mathrm{cm} ) ( c cdot 25 mathrm{cm} ) D. 30 cm | 12 |

59 | A luminous object is placed at a distance of ( 30 mathrm{cm} ) from a convex lens of focal length ( 20 mathrm{cm} . ) On the other side of the lens, at what distance from the lens must a convex mirror of radius of curvature ( 10 mathrm{cm} ) be placed in order to have an upright image of the object coincident with it? ( A . ) 30 ( mathrm{cm} ) B. 40 cm ( c .50 mathrm{cm} ) D. ( 12 mathrm{cm} ) | 12 |

60 | Assertion When white light fall on the compact disc, multicolours are seen after reflection. Reason CD disc behaves like a prism. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion, B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

61 | A ray of light is incident on a plane mirror at an angle of ( 30^{circ} . ) At what angle with the horizontal must a plane mirror be placed so that the reflected ray becomes vertically upwards? ( A cdot 40^{circ} ) B. 20 ( ^{circ} ) ( c cdot 30 ) D. ( 60^{circ} ) | 12 |

62 | Which one of the mirror below (in the absence of the other mirrors) would cause light from a distant source on the left side of the paper to be focussed to a point that is closest to the mirror? ( A ) B. B ( c cdot c ) ( D ) | 12 |

63 | A ray of light is incident normally on a plane glass slab. What will be the angle of refraction? A ( cdot 90^{circ} ) B. ( 180^{circ} ) ( c cdot 60^{circ} ) D. ( 0^{circ} ) | 12 |

64 | The laws of reflection hold good for: A. plane mirror only B. concave mirror only C. convex mirror only D. all mirrors irrespective of their shape | 12 |

65 | Comparing real and virtual images, we may say that A. real images can not be obtained on a screen and virtual images can be B. virtual images can not be obtained on a screen and real images can be C. both real and virtual images can be obtained on a screen D. neither real nor virtual images can be obtained on a screen | 12 |

66 | 14. A fish looking up through water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle (in cm) is (a) 475 (b) 36V5 (c) 3677 (AIEEE 2005) | 12 |

67 | White light is incident normally on a glass slab. Inside the glass slab, A. Red light travels faster than other colours B. Violet light travels faster than other colours c. Yellow light travels faster than other colours D. All colours travel with the same speed | 12 |

68 | An object 0 is placed in front of a mirror. Which is possible position of the image? ( A ) B. B ( c cdot c ) D. | 12 |

69 | Scattering of light is defined as: A. Splitting of light into its component colours B. Deflection of light in different directions when light is incident on extremely small particles c. Bending of light on change of medium D. reversal of light direction from a shiny surface | 12 |

70 | A person cannot see fundamental colours (red, blue, green). This defect is called: A. myopia B. presbyopia c. colour blindness D. astigmatism | 12 |

71 | Large astronomical telescopes always use as objective A. Iens B. mirror c. combinations of lenses D. none of the above | 12 |

72 | A small bulb is placed at the bottom of a tank containing water to a depth of 1 ( m ). Find the critical angle for water air interface and also calculate the diameter of the circular bright patch of light formed on the surface of water [Refractive index of water ( =mathbf{1 . 3 3}] ) | 12 |

73 | Which of the following is/are the factors on which angle of deviation depend? A. Refractive index of the prism B. Angle of the prism c. Angle of refraction D. Both A and B | 12 |

74 | No matter how far you stand from a mirror, your image always appears erect. Then the mirror among the following is likely to be: A. a plane mirror B. a concave mirror c. any type of mirror D. none of the above | 12 |

75 | A beam of light converges at a point ( mathrm{P} ) Now a lens is placed in the path of the convergent beam ( 12 mathrm{cm} ) from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20 ( mathrm{cm}, ) and (b) a concave lens of focal length ( 16 mathrm{cm} ? ) | 12 |

76 | A light ray traveling from one medium into another: A. always bends towards the normal B. always bends away from the normal C. bends towards or away from the normal depending on the densities of the two media D. never suffers a refraction | 12 |

77 | Which colour of light deviates the maximum in the dispersion of white light by the prism? A . Violet B. Blue c. Green D. Red | 12 |

78 | State the approximate value of the critical angle for (a) glass-air surface, (b) water-air surface (Given ( mu_{text {glass}}= ) ( left.mathbf{1 . 5}, boldsymbol{mu}_{boldsymbol{w} boldsymbol{a} boldsymbol{t} e r}=mathbf{1 . 3 3}right) ) A ( cdot ) (a) ( 49^{circ},(b) 49^{circ} ) B . (a) ( 42^{circ},(b) 42^{circ} ) ( mathbf{c} cdot(mathbf{a}) 42^{o},(mathbf{b}) 49^{circ} ) D ( cdot ) (a) ( 49^{circ},(b) 42^{circ} ) | 12 |

79 | State the laws of reflection of light. | 12 |

80 | The ( x-y ) plane is the boundary between two transparent media. Medium-1 with ( z>0 ) has refractive index ( sqrt{2} ) and medium- 2 with ( z<0 ) has a refractive index ( sqrt{3} . ) A ray of light in medium-1 given by the vector ( overrightarrow{boldsymbol{A}}= ) ( 6 sqrt{3} hat{i}+8 sqrt{3} hat{j}-10 hat{k} ) is incident on the plane of separation. Find the unit vector in the direction of refracted ray in medium-2. ( mathbf{A} cdot 45^{circ} ) B. ( 60^{circ} ) ( mathbf{c} cdot 75^{circ} ) D. 30 ( ^{circ} ) | 12 |

81 | A cubical room is formed with 6 plane mirror. An insect moves along diagonal of the floor with uniform speed. The velocity of its image in two adjacent walls are ( 20 sqrt{2} mathrm{cm} / mathrm{s} ). Then the velocity of image formed by the roof is ( mathbf{A} cdot 20 mathrm{cm} / mathrm{sec} ) B. ( 40 mathrm{cm} / mathrm{sec} ) ( mathrm{c} cdot 9 mathrm{cm} / mathrm{sec} ) D. ( 45 mathrm{cm} / mathrm{sec} ) | 12 |

82 | If ( C= ) the velocity of light, which of the following is correct? ( mathbf{A} cdot mu_{0} varepsilon_{0}=c ) В. ( mu_{0} varepsilon_{0}=c^{2} ) ( mathbf{c} ) D. ( _{mu_{0} varepsilon_{0}}=frac{1}{c^{2}} ) | 12 |

83 | A uniform, horizontal beam of light is incident upon a prism as shown in the fig. The prism is in the shape of a quarter cylinder of radius ( R=5 c m, ) and has a refractive index ( frac{2}{sqrt{3}} . ) A patch on the table for a distance ( x ) from the cylinder is unilluminated. The value of ( x ) is A . ( 2.5 mathrm{cm} ) в. 5 ст ( c cdot 5 sqrt{3} mathrm{cm} ) D. ( 10 mathrm{cm} ) | 12 |

84 | A convex lens is made of 3 layers of glass of 3 different materials as in the figure. A point object is placed on its axis. The number of images of the object are ( A ) B. ( c .3 ) ( D ) | 12 |

85 | In the Newton’s rings set up, when a drop of water is introduced between the glass plate and planoconvex lens the observed ring system A. Contracts B. Expands c. Remains the same D. Expands and then contracts | 12 |

86 | The clear sky appears blue because: A. blue light gets absorbed in the atmosphere. B. ultraviolet radiations are absorbed in the atmosphere. C. violet and blue lights get scattered more than lights of all other colours by the atmosphere. D. light of all other colours is scattered more than the violet and blue colour lights by the atmosphere. | 12 |

87 | When the angle of reflection is ( 40^{circ}, ) then the angle between normal and the mirror will be A .40 B. ( 90^{circ} ) ( c cdot 45 ) D. ( 60^{circ} ) | 12 |

88 | A prism ( (mu=1.5) ) has the refracting angle of ( 60^{circ} . ) The deviation of a monochromatic ray incident normally on its one surface will be ( left(sin 48^{circ} 36^{prime}=right. ) ( mathbf{0 . 7 5}) ) ( mathbf{A} cdot 36^{circ} 72 ) B . ( 20^{circ} 30^{prime} ) ( c cdot 18^{circ} ) D. ( 22^{circ} 1^{prime} ) | 12 |

89 | Assertion The images formed by total internal reflections are much brighter than those formed by mirrors or lenses Reason There is no loss of intensity in total | 12 |

90 | Explain how you can take care of your eyes. | 12 |

91 | Write any two differences between regular and irregular (diffused) reflection | 12 |

92 | Fill in the blanks: Magnification of convex mirror is in range and of concave mirror is in range A ( (0,1),(-infty, 0) cup(1, infty) ) (1) B . ( (-1,0),(-infty, infty) ) c. ( (-infty, infty),(1, infty) ) D ( cdot(-infty, infty),(-1,-infty) ) | 12 |

93 | Q Type your question a convex lens. Arrange the steps in the proper sequence. (a) Place the lens on a V-shaped stand. (b) Place the object at ( 2 F_{1} ) (c) Place the object between ( 2 F_{1} ) and ( F_{1} ) (d) Determine the focal length of the lens by focusing the lens to a distant object like a tree. (e) Adjust the position of the screen behind the lens to obtain a clear image and study the nature of the image. (f) Mark the positions of ( F_{1}, 2 F_{1}, F_{2} ) and ( 2 F_{2} ) (g) Focus the lens to a distant object like a tree. (h) Place the object just behind ( 2 F_{1} ) (i) Place the object at ( boldsymbol{F}_{1} ) (j) Place the object between ( F_{1} ) and optic centre of the lens and observe that the image formed is virtual. ( A cdot ) a f ( d h ) e ( g ) e b e ce ej B. b a fhe gec c. a dfge he bece iej D. a df ge he cebeje | 12 |

94 | Which of the following shows the bending of light from rarer (R) into denser (D) medium? ( A ) в. c. D. | 12 |

95 | Focal length of a spherical mirror is ( 200 mathrm{cm} . ) What will be its radius of curvature? A . ( 100 mathrm{cm} ) B. ( 25 mathrm{cm} ) ( c .50 c m ) D. ( 400 mathrm{cm} ) | 12 |

96 | What is the formula for refraction through spherical Lens when the refractive index of the medium on two sides of lens are different? | 12 |

97 | A concave lens of focal length ( 5 mathrm{cm} ) is used as a simple microscope. The image is formed at the least distance of distinct vision. Calculate the angular magnification. | 12 |

98 | A convex lens is immersed in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will A. Decrease B. Become zero c. Become infinite D. Increase | 12 |

99 | The index of refraction of diamond is 2.0. The velocity of light in diamond in cm/s is – A ( .6 times 10^{10} ) В. ( 2 times 10^{10} ) C ( .3 times 10^{10} ) D. ( 1.5 times 10^{10} ) | 12 |

100 | What can you say about the angle of deviation in such a situation? A. Angle of deviation is minimum. B. Angle of deviation is maximum. c. Angle of deviation is constant. D. None of the above | 12 |

101 | How can you determine the focal length of a convex lens experimentally. Draw a rough diagram. | 12 |

102 | State whether given statement is True or False When a point object is at the principal focus of a convex lens, it forms a parallel beam of light after refraction. | 12 |

103 | The power of a lens is ( +2.0 D . ) Find its focal length and state the kind of the lens. A. Convex, ( 50 mathrm{cm} ) B. Convex, ( 200 mathrm{cm} ) c. concave, ( 50 mathrm{cm} ) D. Concave, ( 100 mathrm{cm} ) | 12 |

104 | A plane mirror makes an angle of ( 30^{circ} ) with the horizontal. If a vertical ray strikes the mirror, find the angle between the mirror and the reflected ray ( ? ) | 12 |

105 | Write Newton’s formula for refraction of Light through a lens. Explain the meaning of symbols used. | 12 |

106 | Which of the following occurs in scattering? A. Light is reflected back in the original direction. B. Light is split into its spectrum. C. Photons in the light wave are absorbed by the particles. D. Absorption and re-emission of light energy by small particles. | 12 |

107 | One end of a cylindrical rod is grounded to a hemispherical surface of radius ( R=20 m m . ) It is immersed in water of refractive index ( 1.33 . ) If the refractive index of the hemisphere is ( 1.5 . ) Find the position of an image of an object placed on the axis of the rod inside water at ( 10 mathrm{cm} ) from the pole. | 12 |

108 | Braille system is categorized under: A. non optical aids B. optical aids C. both ( A ) and ( B ) D. none of these | 12 |

109 | A beam of light is incident on a glass slab ( (mu=1.54) ) in a direction as shown in the figure. The reflected light is analysed by a polaroid prism. On rotating the polaroid (take, ( tan 57^{0}= ) 1.54) | 12 |

110 | Why do humans have two eyes? a. The view field is increased up to ( 180^{circ} ) b. Better detection of faint objects c. 3 dimensional view d. More accurate estimation of distance ( A cdot a, b ) and ( d ) B. c and d ( c cdot a, c ) and ( d ) D. All of the above | 12 |

111 | A defective eye cannot see close objects clearly because their image is formed: A. On the eye lens B. Between eye lens and retina c. on the retina D. Beyond retina | 12 |

112 | Spherical mirror with reflecting surface curved inwards is called A. convex mirror B. concave mirror c. curved mirror D. None of these | 12 |

113 | ldentify the wrong description of the given figures A . 1 represents far sightedness B. 2 is correction for short sightedness c. 3 represent far sightedness D. 4 represents correction for far sightedness | 12 |

114 | Find the correct statements related to the image formed by the plane mirror form the given below. A. The image formed is laterally inverted, virtual and erect B. The size of the image is equal to the size of the object. C. The object distance from the plane mirror is equal to the image distance from the plane mirror D. All the above | 12 |

115 | Rainbow is due to This question has multiple correct options A. scattering of light B. refraction of light C . dispersion D. total internal reflection of light | 12 |

116 | When the object is at focus of a concave mirror, the image is formed at A. focus B. centre of curvature c. within focus D. infinity | 12 |

117 | At what distance from a convex lens of focal length ( 0.15 m ) must an object be placed so that the image must be twice the size of the object, when the image is a) real b) virtual | 12 |

118 | A thin lens has a focal length of ( -50 c m ) What kind of lens is it? A. concave lens B. Convex lens c. Concano convex lens D. None | 12 |

119 | An object of height ( 6 mathrm{cm} ) is placed perpendicular to the principal axis of a concave lens of focal length ( 5 mathrm{cm} . ) Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 10 ( mathrm{cm} ) | 12 |

120 | A transparent solid cylindrical rod has a refractive index of ( frac{2}{sqrt{3}} . ) It is surrounded by air. A light ray is incident at the mid- point of one end of the rod as shown in the figure. The incident angle ( theta ) for which the light ray grazes along the wall of the rod is – ( mathbf{A} cdot sin ^{-1}left(frac{1}{2}right) ) B. ( sin ^{-1}left(frac{sqrt{3}}{2}right) ) ( c cdot sin ^{-1}left(frac{2}{sqrt{3}}right) ) D ( cdot sin ^{-1}left(frac{1}{sqrt{3}}right) ) | 12 |

121 | Consider the following statements ( A ) and ( mathrm{B} ) and identify the correct choice A) For a given value of angle of incidence, the angle of deviation produced by a prism increases with increasing of refractive index of the prism B) Angle of deviation produced by a thin prism is independent of angle of incidence A. A is true and B is false B. A is false and B is true c. A and B are true D. A and B are false | 12 |

122 | When light passes from air to glass, it experiences a change of: A. speed only B. wavelength and speed c. frequency only D. frequency and speedd | 12 |

123 | A spherical mirror whose inner hollow surface is the reflecting surface is a – A. convex mirror B. concave mirror c. convex lens D. concave lens | 12 |

124 | If the angle of incidence is ( 50^{circ} ) then calculate the angle between the incidence ray and the reflected ray. A .50 B. 100 c. ( 130^{circ} ) D. ( 80^{circ} ) | 12 |

125 | Find the angle of incidence and angle of reflection from the diagram. A ( cdot 45^{circ}, 40^{circ} ) B . ( 55^{circ}, 55^{circ} ) ( mathbf{c} cdot 60^{circ}, 60^{circ} ) D. ( 30^{circ}, 30^{circ} ) | 12 |

126 | If the incident ray falls on a surface normally, then the angle of reflection is degree A . 90 B. ( c . ) 30 D. 60 | 12 |

127 | State whether the following statement is true or false: The velocity of light is different in different media. | 12 |

128 | A projector lens has a focal length 10 ( mathrm{cm} . ) It throws an image of a ( 2 mathrm{cm} times 2 mathrm{cm} ) Slide on a screen 5 meter away from the lens. Find (i) The size of the picture on the screen and (ii)ratio of illuminations of the slide and of the picture on the screen. | 12 |

129 | A compound lens is made of two lenses in contact having power ( +12.5 D ) and ( -2.5 D . ) An object is placed at ( 15 mathrm{cm} ) from compound lens. Find the position of image formed ( mathbf{A} cdot 60 mathrm{cm} ) B. ( 30 mathrm{cm} ) c. ( 15 mathrm{cm} ) D. ( 45 mathrm{cm} ) | 12 |

130 | Name any two defects vision which can be corrected by any of spectacles. | 12 |

131 | A needle of length ( 5 mathrm{cm}, ) placed ( 45 mathrm{cm} ) from a lens form an image on a screen placed ( 90 mathrm{cm} ) on the other side of the lens. The type of lens and its focal length are : A. convex, 30 cm B. concave, 30 cm c. convex, ( 60 mathrm{cm} ) D. concave, 60 cm | 12 |

132 | Define the following: (a) Total internal reflection (b) Diffraction of light (c) Refraction of light | 12 |

133 | What is seen on the screen when the flame is very close (at about 5cm) to the lens? | 12 |

134 | Internal reflections of light is prevented in human eye by: A . iris B. pupil c. choroid D. blind spot | 12 |

135 | Aqueous humour is a and vitreous humour is ( a ) A. transparent jelly, viscousfluid B. transparent jelly, watery fluid c. viscous fluid, viscous fluid D. viscous fluid, transparent jelly | 12 |

136 | A lens is made of flint glass (refractive index ( =1.5 ) ). When the lens is immersed in a liquid of refractive index 1.25, the focal length: A. Increases to a factor of 1.25 B. Increases to a factor of 2.5 c. Increases to a factor of 1.2 D. Decreases to a factor of 1.2 | 12 |

137 | If a mirror has focal length of ( +15 mathrm{cm} ) then it is a A. Convex mirror B. Concave mirror c. Plane mirror D. None of these | 12 |

138 | A girl viewed an object and found that it is not clearly visible to her. It was found that the image was formed by her eye lens ( 3 mathrm{cm} ) away from the pupil of her eyes.The girl can correct this defect by using a: A. concave lens B. convex lens c. bi-focal lens D. plano-convex lens | 12 |

139 | Correct mirror formula is: A ( cdot frac{1}{v}-frac{1}{u}=frac{1}{f} ) в. ( frac{1}{v}+frac{1}{u}=frac{1}{f} ) c. ( frac{1}{v}-frac{1}{u}=frac{1}{-f} ) D. ( frac{1}{v}+frac{1}{u}=frac{1}{-f} ) | 12 |

140 | What is the function of the iris in human eye? A. Iris restricts the light to pass through the eye over to the retina. B. Iris provides protection to the eye from microorganisms. C. Iris controls the size of the pupil and hence the amount of light entering the eye. D. Iris allows colour detection in eye. | 12 |

141 | Reflection is the ( _{text {十一一一一一一一一一 }} ) Ilight off a surface. | 12 |

142 | (a) Draw and label the diagram given : (i) Incident ray (ii) Refracted ray (iii) Emergent ray (iv) Angle of reflection (v) Angle of deviation (v) Angle of emergence (b) The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light? | 12 |

143 | In case of a virtual and erect image, the magnification created by the mirror is A. positive B. negative c. unity D. infinity | 12 |

144 | Fill in the blank. The reflection of sunlight takes place the water droplets to form a rainbow. A . outside B. inside c. beside D. below | 12 |

145 | A light ray makes an angle of incidence ( 60^{circ}, ) when it falls on a plane reflecting sheet The angle of reflection will be. A ( cdot 60^{circ} ) B. ( 30^{circ} ) ( c cdot 45^{circ} ) D. ( 90^{circ} ) | 12 |

146 | Focal length of a lens is ( 50 mathrm{cm} ). Its power would be: A. 50 dioptres B. 2 dioptres c. 20 dioptres D. None of these | 12 |

147 | Identify the mirrors a) ( mathbf{b}) ) A. ( a= ) Convex mirror ( b= ) Concave mirror B. ( a= ) Concave mirror ( b= ) Convex mirror C ( . a= ) Concave mirror ( b= ) Concave mirror D. ( a= ) Convex mirror ( b= ) Convex mirror | 12 |

148 | A girl with two normal eyes wants to see the full width of her face using a plane mirror. The eye to eye and ear to ear distances of her face are 4 inch and 6 inch respectively. The minimum width of the required mirror is: A. 1 inch B. 2 inch ( c .2 .5 ) inch D. 5 inch | 12 |

149 | When a ray of light passes from an optically more dense medium to a less dense medium, it: A. goes undeviated B. bends towards the normal c. bends away from the normal D. none of these | 12 |

150 | In the displacement method, a convex lens is placed in between an object and a screen. If one of the magnification is 3 and the displacement of the lens between the two positions is ( 24 mathrm{cm}, ) then the focal length of the lens is: A . ( 10 mathrm{cm} ) B. ( 9 mathrm{cm} ) ( c cdot 6 mathrm{cm} ) D. ( 16 / 3 mathrm{cm} ) | 12 |

151 | An object is placed at a distance of ( boldsymbol{f} / mathbf{2} ) from a convex lens. The image will be A. At one of the foci, virtual and double its size B. At ( 3 f / 2 ), real and inverted and erect c. At ( 2 f ), virtual and inverted D. At ( f ), real and inverted | 12 |

152 | If the angle of a prism is ( 60^{circ} ) and angle of minimum deviation is ( 40^{circ}, ) then the angle of refraction will be A ( .30^{circ} ) B . ( 4^{circ} ) ( c cdot 3^{circ} ) D. ( 1.5^{circ} ) | 12 |

153 | Find magnification for lens. ( A ) B. ( c cdot 7 ) D. 12 | 12 |

154 | Why does the sky appears dark instead of blue to astronauts? | 12 |

155 | A divergent lens produces an image of magnification 0.5 when the object distance of ( 10 mathrm{cm} . ) Find the focal power of the lens (in diopters) | 12 |

156 | State whether true or false: A concave lens, if kept at a proper distance from an object, can form its real image. A. True B. False | 12 |

157 | 66. The focal lengths of the objective and the eye-piece of a compound microscope are 2.0 cm and 3.0 cm respectively, The distance between the objective and the eye-piece is 15.0 cm. The final image formed by the eye-piece is at infinity. The two lenses are thin. The distances in cm of the object and the image produced by the objective measured from the objective lens are respectively (a) 2.4 and 12.0 (b) 2.4 and 15.0 (c) 2.3 and 12.0 (d) 2.3 and 3.0 | 12 |

158 | Think about the objects which act as a concave or convex mirrors in your surroundings. Make a table and display it in your class room. | 12 |

159 | Draw a ray diagram for concave mirror when object is placed between focus and centre curvature. Also write position, nature and size of image. | 12 |

160 | A small piece of wire bent into an ( boldsymbol{L} ) shape, with upright and horizontal portions of equal lengths, is placed with the horizontal portion along the axis of the concave mirror whose radius of curvature is ( 10 mathrm{cm} ). If the bend is ( 20 mathrm{cm} ) from the pole of the mirror,then the ratio of the lengths of the images of the upright and horizontal portions of the wire is A. 1: 2 B. 3: 1 c. 1: 3 D. 2: 1 | 12 |

161 | The bottom of glass beaker is made of a thin equiconvex lens having bottom side silver polished as shown in fig. Now the water is filled in the beaker up to a height of ( h=4 m . ) The image of point object floating at middle point of beaker at the surface of water coincides with it. Find out the value of radius (in ( mathrm{m} ) ) of curvature of lens. ( left(a boldsymbol{mu}_{boldsymbol{g}}=mathbf{3} / mathbf{2},_{boldsymbol{a}} boldsymbol{mu}_{boldsymbol{w}}=right. ) ( mathbf{4} / mathbf{3}) ) | 12 |

162 | Four students showed the following traces of the path of a ray of light passing through a rectangular glass slab The trace most likely to be correct is | 12 |

163 | When white light is passed through prism and glass slab separately then we get seven colours as emergent ray in former while same white light in latter. As both are made up of same glass but why getting different results? | 12 |

164 | Answer the following. State the function of iris and ciliary muscles in human eye. | 12 |

165 | Find ( Q 1 ) and ( Q 2 ) | 12 |

166 | The light reflected back into the denser medium when a ray of light passes from a denser to a rarer medium, is said to be ( ldots ) A. Totally relfected B. Totally refracted c. Internally reflected D. Internally refracted | 12 |

167 | 28. The velocity of light in a medium is half its velocity in air. If a ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is (a) 15° (b) 30° (c) 45° (d) 60° | 12 |

168 | Due to refraction, A. Image in the plane mirror is clear B. Polished black surfaces shine C. speed of light is constant in all mediums D. A glass sphere appears attractive | 12 |

169 | An object is placed at ( 40 mathrm{cm} ) from the optic centre of a convex lens on its principal axis. if the focal length of the lens is ( 24 mathrm{cm} ), find how far from the lens the screen should be placed to obtain a well-defined image. A . ( 48 mathrm{cm} ) B. 38 cm ( c .50 mathrm{cm} ) D. ( 60 mathrm{cm} ) | 12 |

170 | Two thin lenses have combined power of 10 ( D ). When separated by ( 20 mathrm{cm} ) their equivalent power is 6.25 D.Their individual powers in ( D ) are A . 3.5 and 6.5 B. 5 and 5 c. 7.5 and 2.5 D. 9.0 and 1 | 12 |

171 | An under-water swimmer cannot see very clearly even in absolutely clear water because of: A. Absorption of light in water B. Scattering of light in water c. Reduction of speed of light in water D. Change in the focal length of eye lens. | 12 |

172 | Image of an object is seen in a plane mirror, the distance from the mirror to the image depends on: A. the distance of the observer from the mirror B. the distance of the object from the mirror c. the distance of both the observer and the object to the mirror D. the thickness of the mirror | 12 |

173 | A diverging lens of focal length ( f_{1} ) is placed in front of and coaxially with a concave mirror of focal length ( f_{2} ). Their separation is d. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement. Then This question has multiple correct options A. the beam diameters of the incident and reflected beams must be the same в. ( d=2left|f_{2}right|-left|f_{1}right| ) c ( cdot d=left|f_{2}right|-left|f_{1}right| ) D. if the entire arrangement is immersed in water, the conditions will remain unaltered | 12 |

174 | Height of the image of an object on an principal axis produced by a convex lens is double the focal length of lens is ( 20 c m, ) then image distance from the lens is: ( mathbf{A} cdot 10 mathrm{cm} ) B. ( 30 mathrm{cm} ) ( mathbf{c} cdot 40 mathrm{cm} ) D. Both (1) and (2) | 12 |

175 | State whether true or false: The principal focus of a spherical mirror lie midway between the pole and centre of curvature. A. True B. False | 12 |

176 | Why red colour is given to signals to be viewed from a distance? | 12 |

177 | A clock fixed on a wall shows time 04: ( 25: 37 . ) What time will its image in a plane mirror show? A .07: 43: 32 B. 07: 43: 32 c. 07: 35: 23 D. 43: 27: 36 | 12 |

178 | 24. A thin convex lens made from crown glass has focal length f. When it is measured in two different liquids having refractive indices , it has the focal lengths f, and f, respectively. The correct relation between the focal lengths is (a) f2 > f and f, becomes negative (b) both fi and f become negative (c) fi=f2 f and f becomes negative (JEE Main 2014) | 12 |

179 | Certain plane wavefronts are shown in figure. The refractive index of medium is 4 B. ( c cdot 1.5 ) D. cannot be determined | 12 |

180 | Inner side of the cylindrical tube of a periscope is blackened to avoid: A. unwanted refraction B. unwanted reflection c. diffusion D. both a and | 12 |

181 | An object is seen first in red light and then in violet light through a simple microscope. In which case is the magnification larger? | 12 |

182 | If the minimum deviation produced by a prism of refracting angle 60 is ( 30, ) then calculate the refractive index of the material of the prism. A .2 B. 1.414 c. ( sqrt{13} ) D. 4 | 12 |

183 | An incident ray strikes a plane mirror at an angle of incidence of ( 40^{circ} . ) What is the percentage decrease in the angle of reflection if the incident ray moves to an angle of incidence of ( 30^{circ} ? ) A . ( 10 % ) B . 20% c. ( 25 % ) D. 30% | 12 |

184 | One can not see through fog because: A. fog absorbed light B. light is scattered by the droplets in fog C. light surfers total reflection by the droplets in the fog D. the refractive index of fog is in infinity | 12 |

185 | Which prism surface will behave as mirror? | 12 |

186 | You are able to see in shaded areas, such as under a tree, because light has undergone: ( A ). refraction B. incident bending c. a change in speed D. diffused reflection | 12 |

187 | (a) A student suffering from myopia is not able to see distinctly the objects placed beyond ( 5 m . ) List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain (i) why the student is unable to see distinctly the objects placed beyond ( 5 m ) from his eyes. (ii) the type of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens. (b) If, in this case, the numerical value of the focal length of the corrective lens is ( 5 m ), find the power of the lens as per the new Cartesian sign convention. | 12 |

188 | A linear object of size ( 1.5 mathrm{cm} ) placed at ( 10 mathrm{cm} ) from a lens of focal length ( 20 mathrm{cm} ) The optic centre of lens and the object are displaced a distance ( Delta=0.5 mathrm{cm} ) as shown in the figure. The magnification of the image formed is ( mathrm{m} ) (Take optic centre as origin). The coordinates of image of ( A ) and ( B ) are ( left(x_{1}, y_{1}right) ) and ( left(x_{2}, y_{2}right) ) respectively. Then This question has multiple correct options | 12 |

189 | Assertion: Diamond glitters brilliantly. Reason: Diamond does not absorb sunlight. A. Both assertion and reason are true but the reason is the correct explanation of assertion B. Both assertion and reason are true but the reason is not the correct explanation of assertion C. Assertion is true but reason is false D. Both the assertion and reason are false E. Reason is true but assertion is false | 12 |

190 | Amount of light entering the eye is controlled by: A. Iriss B. Cornea c. Pupil D. crystalline lens | 12 |

191 | A direct-vision prism is made out of three prisms, each with a refracting angle of ( phi=60^{circ}, ) attached to each other as shown in Fig. Light of a certain wavelength is incident on the first prism. The angle of incidence is ( 30^{circ} ) and the ray leaves the third prism parallel to the direction of incidence. The refractive index of the glass of the first and third prisms is ( 1.5 . ) Find the refractive index of the material of the middle prism. ( (sqrt{6}=2.45) ) | 12 |

192 | Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection? | 12 |

193 | Give scientific reason: Danger signals are red in color. | 12 |

194 | A beam of light striking the surface of a glass plate from the air as shown in above figure. If the angle between reflected beam and refracted beam is 90 degree, Find out the index of refraction of the glass? ( A cdot sin 55^{circ} ) B. ( frac{1}{sin 55^{circ}} ) c. ( frac{1}{sin 35^{circ}} ) D. ( frac{sin 55^{circ}}{sin 35^{circ}} ) E ( cdot frac{sin 35^{circ}}{sin 55^{circ}} ) | 12 |

195 | Fill in the blanks: Rainbows are caused by the dispersion of white light in A. raindrops B. prism c. glass slab D. air | 12 |

196 | The impression of an image on the brain for one sixteenth of a second is called | 12 |

197 | Two convex lenses have focal lengths 10 ( mathrm{cm} ) and ( 40 mathrm{cm} . ) If a telescope has to be made by using these two lenses 1. The distance between the lenses should be ( 50 mathrm{cm} ) 2. The distance between the lenses should be ( 30 mathrm{cm} ) 3. The magnifying power of this telescope will be 5 4. An inverted image will be produced in this telescope Which two of the give are correct? A. 1 and 4 B. 2 and 4 c. 1 and 3 D. 3 and 4 | 12 |

198 | A person wear normal spectacles in which the distance of glasses and eyes is approximately ( 2 mathrm{cm}, ) then power required is ( -5 D . ) If he wears contact lens, then the required power is? A . -5.2 D B. -4.54 D c. ( +5.2 mathrm{D} ) D. +4.7 D | 12 |

199 | A convex lens of focal length ( 0.15 mathrm{m} ) is made of a material of refractive index 2 When it is placed in a liquid, its focal length increases by ( 0.225 m . ) The refractive index of the liquid is A ( cdot frac{7}{4} ) B. ( frac{5}{4} ) ( c cdot frac{9}{4} ) D. ( frac{3}{2} ) | 12 |

200 | The following conditions are seen in which defect of vision? a. The vision is clear up to a distance of few meters b. It may occur due to elongation of eyeball c. The image of the object is formed in front of the retina A. Myopia B. Cataract c. Presbyopia D. Hypermetropia | 12 |

201 | The least distance of distinct vision for a young adult with normal vision is about A. ( 1 mathrm{m} ) B. 2.5 ( m ) c. ( 0.25 mathrm{m} ) D. 25 m | 12 |

202 | Transparent front part of eye is: A . pupil B. cornea ( c ). iris D. retina | 12 |

203 | If the focal length of a convex mirror is ( 16 mathrm{cm}, ) what is its radius of curvature? ( A cdot 8 mathrm{cm} ) B. ( 16 mathrm{cm} ) c. ( 32 mathrm{cm} ) D. ( 10 mathrm{cm} ) | 12 |

204 | A hair dresser stand with her nose 20 ( mathrm{cm} ) in front of a plane mirror for what distance must she focus her eyes in order to see her nose in the mirror? A. ( 50 mathrm{cm} ) B. 30 cm ( c .60 mathrm{cm} ) D. ( 40 mathrm{cm} ) | 12 |

205 | Light travels through a glass plate of thickness ‘t’ and refractive index ‘n’. If c is the velocity of light in vacuum, then the time taken by light to travel through the thickness of the plate will be A ( cdot frac{n t}{c} ) B. ( frac{t}{n c} ) c. ( frac{t c}{n} ) D. ( frac{c}{n t} ) | 12 |

206 | A thin lens of refractive index 1.5 has a focal length of ( 15 mathrm{cm} ) in air. When the lens is placed in a medium of refractive index ( 4 / 3, ) its focal length will becomes ( mathrm{cm} ) | 12 |

207 | A boy in front of mirror throws ball from right hand and catches with left hand. The direction of image of ball as seen from image of boy is: A. Right hand to left hand B. Left hand to Right Hand c. Right hand to Right Hand D. Left Hand to Left Hand | 12 |

208 | Draw a labeled sketch of the human eye. | 12 |

209 | Draw a ray diagram of reflecting type telescope and hence give the advantage of reflecting type telescope. | 12 |

210 | Three right angled prisms of refractive indices ( n_{1}, n_{2} ) and ( n_{3} ) are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then A ( . n_{1}=n_{2}=n_{3} ) B . ( n_{1}=n_{2} neq n_{3} ) c. ( 1+n_{1}=n_{2}+n_{3} ) D. ( 1+n_{2}^{2}=n_{1}^{2}+n_{3}^{2} ) | 12 |

211 | What happens to the speed of light when it undergoes refraction in a medium ? Hence define absolute refractive index of a medium. | 12 |

212 | Twinkling of stars is on account of A. Large distance of stars and storms in air B. Small size of stars C. Large size of stars D. Large distance of stars and fluctuations in the density of air | 12 |

213 | Define critical angle and polarising angle what is the relation between the two angles? | 12 |

214 | Match the following ( begin{array}{lllll}text { List I } & & text { List II } & \ text { Adjustment } & & & \ text { of focal } & text { a } & text { Accommodation } \ text { length } & & & \ text { 2 } & begin{array}{l}text { distance of } \ text { distinct vision }end{array} & text { b } & text { Infinity } \ text { 3 } & begin{array}{l}text { Farthest point } \ text { of visibility }end{array} & text { c } & text { 25 cm } \ text { 4 } & begin{array}{l}text { Vision } \ text { impairment }end{array} & text { d } & text { Cataract }end{array} ) A . ( 1-b, 2-c, 3-a, 4-d ) B. 1-d, 2-c, 3-b, 4-a c. ( 1- ) a, ( 2-c, 3-b, 4-d ) D. 1-c, 2-a, 3-d, 4-b | 12 |

215 | The sum of the reciprocals of object distance and image distance is equal to the of a mirror. A. focal length B. reciprocal of the focal length c. radius of curvature D. reciprocal of the radius of curvature | 12 |

216 | Mirage is an example of | 12 |

217 | Geometrical Optics 73. A Galileo telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be (a) 98 cm (b) 100 cm (c) 150 cm (d) 200 cm | 12 |

218 | Consider an optical system placed in water ( (mu=4 / 3) ) PQRS is a hollow glass slab filled with air ( (mu=1) ) This slab is kept on the principle axis of a lens in such a way that surface PS makes an angle ( theta ) with the axis of the lens. ( left(0<theta<180^{circ}right), ) then This question has multiple correct options A. for transmission of light takes place through slab ( theta_{min }=frac{pi}{2}-sin ^{-1}(0.75) ) B cdot for transmission of light through slab ( theta_{text {max }}=frac{pi}{2}+sin ) ( -1(0.75) ) C. for ( x=50 mathrm{cm} ) final image is at ( 3 mathrm{m} ) distance from 0 D. for ( x=100 mathrm{cm} ) final image is at ( 3 mathrm{m} ) distance from 0 | 12 |

219 | When the angle of incidence of a ray is greater than the critical angle, the refracted ray is in the same medium, i.e., the light is totally reflected in the same medium. This is known as A. Total internal reflection B. Critical reflection c. Mirage D. Optical illusion | 12 |

220 | The figure shows cross section of a hollow glass tube of internal radius ( r ) external radius ( boldsymbol{R} ) and index of refraction ( n . ) For two rays DE and ( A B C ) (in which DE lies on ODE and DE is parallel to BC), the separation ( r_{1} ) will be : A ( cdot r_{1}=(n-1) R ) ( mathbf{B} cdot r_{1}=n^{2} R ) ( mathbf{c} cdot r_{1}=n r ) ( mathbf{D} cdot r_{1}=n^{2} r ) | 12 |

221 | The image of an object is formed by a convex lens. When that object is placed beyond the focal length is – A. Virtual and inverted B. Virtual and magnified c. Real and inverted D. Real and magnified | 12 |

222 | The field of view is maximum for A. Plane mirror B. Concave mirror c. convex mirror D. plano concave mirror | 12 |

223 | Match the following A ( mathbf{A} ) 1-b, 2-c, 3-a, 4-d B. ( 1-c, 2-d, 3-b, 4-a ) c. ( 1-a, 2-c, 3-b, 4-d ) D. ( 1-c, 2-a, 3-d, 4-b ) | 12 |

224 | The image of a square hole in a screen illuminated by light is obtained on another screen with the help of a converging lens. The distance of the hole from the lens is ( 40 mathrm{cm} ). If the area of the image is nine times that of the hole, the focal length of the lens is : ( mathbf{A} cdot 30 mathrm{cm} ) B. ( 50 mathrm{cm} ) c. ( 60 mathrm{cm} ) D. ( 75 mathrm{cm} ) | 12 |

225 | A bi-convex lens is formed with two plano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both curved surfaces are of the same radius of curvature ( mathrm{R}=14 mathrm{cm} . ) For this bi-convex lens, for an object distance of ( 40 mathrm{cm}, ) the image distance will be A. ( -280.0 mathrm{cm} ) B. ( 440.0 mathrm{cm} ) ( c .21 .5 mathrm{cm} ) D. ( 13.3 mathrm{cm} ) | 12 |

226 | Fill up the blanks: a) light sensitive screen of human eye…………….. b) near sightedness is corrected by c) hypermetropia is corrected by….. d) range of vision for a normal eye…………. ( A cdot ) a. retina b. concave lens c. convex lens d. ( 25 mathrm{cm} ) -infinity B. a. cornea b. convex lens c. concave lens d. ( 0-25 mathrm{cm} ) c. a. iris b. converging lens c. diverging lens d. 0 -infinity D. a. sclera b. diverging lens c convex lens d. infinity | 12 |

227 | A biconvex lens made of glass(refractive index 1.5 ) has two spherical surfaces having radii 20cm and ( 30 mathrm{cm} . ) Calculate its focal length. | 12 |

228 | Two refracting media are separated by a spherical interface as shown in figure. PP’ is the principle axis. ( mu_{1} ) and ( mu_{2} ) are the refractive indices of medium of incidence and medium of refraction respectively. Then, This question has multiple correct options ( mathbf{A} cdot ) if ( mu_{2}>mu_{1} ) then there cannot be a real image of real object ( mathbf{B} cdot ) if ( mu_{2}>mu_{1} ) then there cannot be a real image of virtual object. ( mathrm{C} cdot ) if ( mu_{1}>mu_{2} ) then there cannot be a virtual image of virtual object D. if ( mu_{1}>mu_{2} ) then there cannot be a real image of real object | 12 |

229 | Assertion In the absence of atmosphere the sky would appear black. Reason Atmosphere scatters the light and hence we get blue colour. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

230 | The image of an object is formed 3 times by a convex lens. On interchanging the positions of object and screen, what will be the magnification in that case? | 12 |

231 | A converging lens of focal length 6.25 ( mathrm{cm} ) is used as a magnifying glass. If near point of the observer is ( 25 mathrm{cm} ) from the eye and the lens is held close to the eye, then the magnification is : ( A cdot 4 ) B. 5 ( c cdot 8 ) D. 10 | 12 |

232 | Figure shows three lenses of equal radii of curvature of the curved surfaces. the ratio of focal lengths of ( mathrm{P}, mathrm{Q} ) and ( mathrm{R} ) is A .1: 1: 1 B. 1:1:-1 ( c ) D . – -1:2:- | 12 |

233 | Focal length of the plano-convex lens is ( 15 mathrm{cm} . ) A small object is placed at ( A ) as shown in the figure. The plane surface is silvered. The image will form at A. ( 60 mathrm{cm} ) to the left of lens B. ( 12 c m ) to the left of lens ( mathrm{c} .60 mathrm{cm} ) to the right of lens D. ( 30 c m ) to the left of lens | 12 |

234 | The focal length of an equiconcave lens is ( frac{3}{4} ) times of radius of curvature of its surfaces. Find the refractive index of the material of the lens. Under what condition will this lens behave as a converging lens? | 12 |

235 | A light ray, going through a prism with the angle of prism ( 60^{circ}, ) is found to deviate by ( 30^{circ} . ) What limit on the refractive index can be put from these data ? | 12 |

236 | The radii of curvature of the surfaces of a double convex lens are ( 20 mathrm{cm} ) and 40 ( mathrm{cm} ) respectively, and its focal length is ( 20 mathrm{cm} . ) What is the refractive index of the material of the lens.? A ( cdot frac{5}{2} ) B. ( frac{4}{3} ) ( c cdot frac{5}{3} ) D. ( frac{4}{5} ) | 12 |

237 | Which of the following statement is/ are correct? I. A person suffering from myopia can see distant obhects clearly. II.. The bluish color of water in deep sea is only due to reflection of sky in water. III. In vacuum, all the colored of the light move with the same speed. IV. At noon, the sun appears white as light is least scattered A. I only B. Il only c. I and II only D. III and IV only | 12 |

238 | Assertion A ray of light is incident from outside on a glass sphere surrounded by air. This ray may suffer total internal reflection at second interface. Reason If a ray of light goes from denser to rarer medium, it bends away from the normal. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

239 | Given is a diagram showing a defect of human eye Study it and answer the following questions: Name the type of lens used to correct the defect. A. Convex B. Concave c. Bifocal D. All of the above can be used | 12 |

240 | Match the following ¡. a. Back surface of eye where image is Cornea formed ii. Pupil b. Coloured part of eye iii. c. Membrane that refracts light and Retina protects the eye ¡V. Iris d. Transparent opening of eye.Light passes through it ( A cdot ) i-c ,ii-d,iii-a,iv-b B. i-a,ii-c,iii-b,iv-d C . i-d,ii-a,iii-b,iv-c D. i-b,ii-c,iii-d,iv-a | 12 |

241 | An object ( 2 mathrm{cm} ) high is placed at a distance of ( 16 mathrm{cm} ) from a concave mirror, which produces a real image 3 cm high. What is the focal length of the mirror? A . ( -48 c m ) B. ( -36 c m ) ( mathrm{c} .-63 mathrm{cm} ) D. -83 cm | 12 |

242 | A line coming from point (3,4) is reflected on a point A of x-axis and it passes through point (1,8) then coordinate of point A is A ( cdot(7 / 3,0) ) В ( cdot(5,0) ) C ( cdot(29 / 3,0) ) D cdot ( (9 / 2,0) ) | 12 |

243 | The term refraction of light is best described by: A. The bending of light rays when they enter from one medium to another medium B. Splitting of white light into seven colours when it passes through the prism C. Bending of light round corners of obstacles and apertures D. Coming back of light from a bright smooth surface | 12 |

244 | What is lateral shift? Establish relation between focal length and radius of curvature of a mirror. | 12 |

245 | 19. A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is (a) 1/10 m/s (b) 1/15 m/s (c) 10 m/s (d) 15 m/s (AIEEE 2011) | 12 |

246 | A ( 5 c m ) long needle lies along the principal axis axis of a concave mirror of focal length ( 20 mathrm{cm} ) in such a way that the end closer to the pole is ( 40 mathrm{cm} ) from it. Find the length of the image of the needle formed by the mirror. | 12 |

247 | Why do we study the Dispersion phenomenon using a glass prism and not a glass slab? A. Light doesn’t undergo any deviation inside a glass slab; so cannot be used to study Disprsion B. All of the dispersion that takes place at the first interface is exactly reversed at the second parallel surface, ‘undoing’ the effect of the first interface. C. Dispersion occurs only in prism and not in glass slab D. None of the above | 12 |

248 | A simple telescope used to view distant objects has eyepiece and objective lens of focal lengths ( f_{e} ) and ( f, ) respectively. Then | 12 |

249 | When all the parallel rays reflected from a mirror are parallel, the reflection is known as: A . regular reflection B. irregular reflection c. diffused reflection D. none of these | 12 |

250 | Write short notes on dispersion of light. | 12 |

251 | Which material should be chosen to make the concave mirrors of a high resolution telescope so that it can also withstand temperature variations? A. Quartz B. Flint glass c. crown glass D. combination of Flint and Silica | 12 |

252 | Which of the following ray diagram is correct? ( A ) B. ( c ) ( D ) | 12 |

253 | In vacuum, to travel distance ‘d’, light takes time ‘t’ and in medium to travel distance ( ^{prime} 5 d^{prime}, ) it takes time ‘T’. The critical angle of the medium is. A ( cdot sin ^{-1}left(frac{5 T}{t}right) ) в. ( sin ^{-1}left(frac{5 t}{3 T}right) ) c. ( sin ^{-1}left(frac{5 t}{T}right) ) D. ( sin ^{-1}left(frac{3 t}{5 T}right) ) | 12 |

254 | The diagram below a ray of light incident on a glass prism. Calculate the refractive index of the glass prism. | 12 |

255 | The power of a lens is – ( 5 D ) (i) find its focal length. (ii) name the type of lens. | 12 |

256 | One half of a convex lens of focal length ( 10 mathrm{cm} ) is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of ( 30 mathrm{cm} ) from the lens? Draw a ray diagram to justify your answer. A ( 4 mathrm{cm} ) tall object is placed perpendicular to its principal axis of a convex lens of focal length ( 20 mathrm{cm} . ) The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image. | 12 |

257 | We should look at sun or a powerful light directly. Is the statement True or False A. True B. False | 12 |

258 | In which of the following we see the phenomena of total internal reflection? A. Rainbows c. camera D. Both a and | 12 |

259 | A light ray of a single wavelength is incident on the prism. The emergent light is best described by a: A. spectrum of component colours B. laterally shifted ray of same wavelength. c. light ray of same wavelength deviated by an angle. D. light ray of different wavelength deviated by an angle | 12 |

260 | The human eye part which can be used again and again for forming different images is called: A . iris B. pupil c. cornea D. retina | 12 |

261 | A convex lens is used to form an image of an object on a screen. If the upper half of the lens is covered so that it becomes opaque. Then : A. only half of the image will be visible B. the image position shifts towards the lens c. the image position shifts away from the lens D. the brightness of the image reduces | 12 |

262 | Assertion Fine particles in atmosphere scatter the light of shorter wavelength more. Reason Sky appears blue. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

263 | During dispersion through prism, red light travels fastest and violet travels slowest of all the seven colours. As a result: A. red bends the least and violet bends the most B. red bends the most and violet bends the least C. both red and violet bend the least of all colours D. both red and violet bend the most of all colours | 12 |

264 | An object and a screen are mounted on an optical bench and a converging lens is placed between them so that a sharp image is received on the screen. The linear magnification of the image is 2.5 The lens is now moved ( 30 mathrm{cm} ) nearer to the screen and a sharp image is again formed on the screen. The focal length of the lens is: A . ( 14.0 mathrm{cm} ) в. ( 14.3 mathrm{cm} ) c. ( 14.6 mathrm{cm} ) D. ( 14.9 mathrm{cm} ) | 12 |

265 | The splitting of white light into several colours on passing through a glass prism is due to ( A ). refraction B. reflection c. dispersion D. none of these | 12 |

266 | The incident ray,reflected ray and the normal ray, all lie on the plane. A. different B. same c. mutually perpendicular D. orthogonal | 12 |

267 | How the eye of a person suffering from myopia can be corrected? Explain with the help of ray diagram. | 12 |

268 | Sunlight can undergo internal reflection if it enters from: A. glass to air B. air to glass c. air to water D. water to glass | 12 |

269 | 1. An astronomical telescope has a large aperture to (a) reduce spherical aberration. (b) have high resolution. (c) increases the span of observation. (d) have low dispersion. (AIEEE 2002) | 12 |

270 | An object is kept ( 60 mathrm{cm} ) from a lens gives a virtual image ( 20 mathrm{cm} ) in front of lens. What is the focal length of the lens? Is it converging lens or diverging lens? | 12 |

271 | A compound microscope has an objective of focal length ( 1 mathrm{cm} ) and an eyepiece of ( 4 mathrm{cm} . ) If the tube length is 20 ( mathrm{cm} . ) Then the magnification of the compound microscope is : (final image is at D A . 145 B. 14.5 ( c cdot 1.45 ) D. None of these | 12 |

272 | For a prism kept in air, it is found that for an angle of incidence ( 60^{circ} ), the angle of refraction ( ^{prime} boldsymbol{A}^{prime}, ) angle of deviation ( ^{prime} boldsymbol{delta}^{prime} ) and angle of emergence ( ^{prime} e^{prime} ) become equal. The minimum angle of incidence of a ray that will be transmitted through the prism is A . 1.73 в. 1.15 c. 1.5 D. 1.33 | 12 |

273 | How can we explain the reddish appearance of sun at sunrise or sunset? A. Scattering of blue light is more than the scattering of red light B. Scattering of red light is more than the scattering of blue light C. Intensity of sun reduces during sunrise and sunset D. Due to the view angle, it appears blue | 12 |

274 | Where would an object be placed in a medium of refractive index ( mu_{1}, ) so that its real image is formed at equidistant from sphere (of radius ( mathrm{R} ) and refractive index ( mu_{2} ) ) which is also placed in the medium of refractive index ( mu_{1} ) as shown in figure? A ( cdotleft(frac{mu_{2}-mu_{1}}{mu_{2}+mu_{1}}right) R ) B ( cdotleft(frac{mu_{2}}{mu_{2}-mu_{1}}right) R ) c. ( left(frac{mu_{1}}{mu_{2}-mu_{1}}right) R ) D. ( left(frac{mu_{2}+mu_{1}}{mu_{2}-mu_{1}}right) R ) | 12 |

275 | The distance between an object and its real image formed by a convex lens cannot be A. greater than ( 2 f ) B. less than ( 2 f ) c. greater than ( 4 f ) D. less than ( 4 f ) | 12 |

276 | Effect of dispersion of light among the following is: A . Mirage B. Blue colour of the sky c. Rainbow D. Twinkling of stars | 12 |

277 | A convex lens of focal length ( 15 mathrm{cm} ) is placed infront of a plane mirror at a distance ( 25 mathrm{cm} ) from the mirror. Where on the optical axis and from the centre of the lens should a small object be placed such that the final image coincides with the object? A. ( 15 mathrm{cm} ) and on the opposite side of the mirror B. ( 15 mathrm{cm} ) and between the mirror and the lens c. ( 7.5 mathrm{cm} ) and on the opposite side of the mirror D. ( 7.5 mathrm{cm} ) and between the mirror and the lens | 12 |

278 | Can a concave lens form an image of size two times that of the object? A. Yes B. No c. sometimes D. None of these | 12 |

279 | The image which can be obtained on a screen is called A. a virtual image B. a real image c. either a real or a virtual image D. neither a real nor a virtual image | 12 |

280 | Two examples of non-luminous objects are: A. stars, the moon B. a burning candle, a glowing bulb c. the moon, a spoon D. stars, a spoon | 12 |

281 | Why is the ratio of the velocities of light of wavelengths ( 4000 A ) and ( 8000 A ) in vacuum ( 1: 1 ? ) | 12 |

282 | An object is placed at a distance of 40 ( mathrm{cm} ) in front of a concave mirror of focal length ( 20 mathrm{cm} . ) The image produced is: A. real, inverted and smaller in size B. real, inverted, and of same size c. real and erect D. virtual and inverteo | 12 |

283 | Assertion The minimum distance between an object and its real image formed by a convex lens is ‘2 ( f^{prime} ) Reason The distance between object and its real image is minimum when its magnification is one. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is incorrect but Reason is correct D. Both Assertion and Reason are incorrect | 12 |

284 | Light is A. An electromagnetic radiation B. A transverse wave c. Massless D. All of the above | 12 |

285 | If the angle between incident ray and normal is ( 30^{circ}, ) choose the correct option: A. Angle between incident ray and mirror ( =60^{circ} ) angle between reflected ray and mirror ( =60^{circ} ) Angle between normal and the mirror ( =90^{circ} ) B. Angle between incident ray and mirror ( =30^{circ} ) angle between reflected ray and mirror ( =30^{circ} ) Angle between normal and the mirror ( =30^{circ} ) C. Angle between incident ray and mirror ( =120^{circ} ) angle between reflected ray and mirror ( =30^{circ} ) Angle between normal and the mirror ( =30^{circ} ) D. Angle between incident ray and mirror ( =60^{circ} ) angle between reflected ray and mirror ( =30^{circ} ) Angle between normal and the mirror ( =120^{circ} ) | 12 |

286 | What is scattering of light? | 12 |

287 | How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? A. Just put them side by side. B. one placed on top of the other c. one placed inverted with respect to the other. D. none of these. | 12 |

288 | ( overrightarrow{boldsymbol{E}} times overrightarrow{boldsymbol{B}} ) equals to | 12 |

289 | ( frac{sin i}{sin r}=dots dots ) ( mathbf{A} cdot mathbf{1} ) B. 2 c. constant D. Variable | 12 |

290 | The focal length of a plane mirror is A. positive B. negative c. zero D. infinite | 12 |

291 | Assertion Critical angle of light passing from glass to air is minimum for violet color. Reason The wavelength of blue light is greatest to the light of other colors. | 12 |

292 | The refractive index of a medium: ( mathbf{A} cdot ) is defined with respect to another medium B. is an absolute constant for a medium C. depends on the frequency of the light in the medium D. is more for higher intensity of light ray | 12 |

293 | The near point of a normal human eye is A ( .25 m ) в. ( 17 m ) ( c .1 m ) D. ( 25 mathrm{cm} ) | 12 |

294 | The image of an object formed by a convex lens is of the same size as the object. If the image is formed at a distance ( 50 mathrm{cm} ) from the lens at what distance from the lens is the object placed? Find the focal length and power of the used. | 12 |

295 | Reflection can occur on A. Transparent surfaces B. Translucent surfaces c. Opaque surfaces D. ( B ) and ( c ) | 12 |

296 | A point source ( S ) is placed at a distance of ( 15 mathrm{cm} ) from a converging lens of focal length ( 10 mathrm{cm} ) on its principal axis. Where should a diverging mirror of focal length ( 12 c m ) be placed so that a real image is formed on the source itself? | 12 |

297 | A child is standing in tront ot a straight plane mirror. His father is standing behind him, as shown in the fig. The height of the father is double the height of the child. What is the minimum length of the mirror required so that the child can completely see his own image and his fathers image in the mirror? Given that the height of father is ( 2 H ) ( mathbf{A} cdot H / 2 ) B. ( 5 H / 6 ) c. ( 3 H / 2 ) D. None of these | 12 |

298 | What is the far point of a normal human eyes? | 12 |

299 | A crack in a glass vessel often shines like a mirror because of A. Total reflecting surface B. Reflection c. Refraction D. All | 12 |

300 | When a wave travels from one medium to another, the quantity which will not change is its A. Amplitude B. Velocity c. Frequency D. Intensity | 12 |

301 | The radius of curvature of a spherical mirror is : A. equal to half its focal length B. equal to one-fourth of its focal length c. equal to its focal length D. twice its focal length | 12 |

302 | Reflection is the ( ldots ). Of light off a surface. A. Bouncing B. hitting c. firing D. all | 12 |

303 | I ne retractıve index of the materıal of a concave lens is ( mu . ) It is immersed in a medium of refractive index ( mu_{1} . A ) parallel beam of light is incident on the lens. The path of the emergent rays when ( mu_{1}>mu ) is : ( mathbf{A} ) B. ( mathbf{c} ) D. | 12 |

304 | Assertion When a plane wave passes through a thin prism, the emerging wavefront gets titled. Reason Speed of light is less in glass than in air. A. If both assertion and reason are true and reason is the correct explanation of assertion. B. If both assertion and reason are true and reason is not the correct explanation of assertion. c. If assertion is true but reason is false D. If both assertion and reason are false | 12 |

305 | What happens when a ray of light is made to fall on a mirror along the normal? A. The ray that comes after reflection makes ( 60^{circ} ) with the mirror B. The ray that comes after reflection will be parallel to the mirror c. The ray after reflection retraces its path. D. After reflection, the ray does not come back | 12 |

306 | When the object is placed ( 4 mathrm{cm} ) from the objective of microscope, the final image formed coincides with the object. The final image is at the least distance of distinct vision ( (24 mathrm{cm}) . ) If the focal length of eye piece is ( 8 mathrm{cm} ) then the focal length of objective is A . ( 3.25 mathrm{cm} ) B. ( 2 c m ) ( mathrm{c} .3 .9 mathrm{cm} ) D. ( 4.2 mathrm{cm} ) | 12 |

307 | In displacement method, the distance between object and screen is 96 cm. The ratio of lengths of two images formed by a converging lens placed between them is ( 4 . ) Then This question has multiple correct options A. Ratio of the length of object to the length of shorter image is 2 B. Distance between the two positions of the lens is ( 32 mathrm{cm} ) C. Focal length of the lens is ( 64 / 3 mathrm{cm} ) D. When the shorter image is formed on screen, distance of the lens from the screen is ( 32 mathrm{cm} ) | 12 |

308 | When an object is placed at a distance of ( 60 mathrm{cm} ) from a convex mirror, the magnification produced is 1/2. Where should the object be placed to obtain a magnification of 1/3? | 12 |

309 | A ray is incident at an angle of incidence on one surface of a prism of small angle ( A ) and emerges normally from the opposite surface. If the refractive index of the material of the prism is ( mu, ) the angle of incidence ( i ) is nearly equal to : ( A cdot A / mu ) в. ( A / 2 mu ) c. ( mu / A ) D. ( mu A ) | 12 |

310 | Why is a normal eye not able to see clearly the objects placed closer than 25 ( mathrm{cm} ? ) | 12 |

311 | Which of the following lens is used to minimise myopia? A. Convex lens B. Concave lens c. Cylindrical lens D. Planar lens | 12 |

312 | ( A 16 mathrm{cm} ) long pencil is placed as shown in figure. The central point ( C ) is ( 45 mathrm{cm} ) away from a ( 20 mathrm{cm} ) focal length lens and ( 15 mathrm{cm} ) above the optic axis. Find the length of image. A . ( 14.2 mathrm{cm} ) B. ( 12.3 mathrm{cm} ) ( c .17 .1 mathrm{cm} ) D. ( 4.5 mathrm{cm} ) | 12 |

313 | Describe the compound microscope on the following headings (i) Labelled Ray diagram of formation of image. (ii) Magnifying power when final image is formed at least distance of distinct vision. | 12 |

314 | When light passes through prism it is : A. Deviated B. Deviated and dispersed C . Reflected D. Laterally Displaced | 12 |

315 | Out of the following, select the correct statements: This question has multiple correct options A. Mirage and looming take place in hot places B. An object is not visible when its refractive index is unity C. On increasing the angle of incidence, the angle of deviation also increases D. During hot summer days, the trees and other tall objects seem to be quivering because the density of air changes in and irregular way | 12 |

316 | Obtain relation when object distance varies in a convex lens of focal length ( mathrm{f} ) | 12 |

317 | Why is it difficult to read from image of a book in plane mirror? A. Due to lateral inversion B. Due to scattering c. Due to vertical inversion D. Due to loss on reflection | 12 |

318 | A ( 2.0 c m ) object is placed ( 15 c m ) in front of a concave mirror of focal length ( 10 mathrm{cm} ) What is the size and nature of the image? A. ( 4 c m ), real B. ( 4 mathrm{cm} ), virtual c. ( 1.0 mathrm{cm} ), real D. None of these | 12 |

319 | The angle made by incident ray of light with the reflecting surface is called A. Glancing angle B. Angle of incidence c. Angle of deviation D. Angle of refraction | 12 |

320 | Two plano-concave lenses of glass of refractive index 1.5 have radii of curvatures ( 20 mathrm{cm}, 30 mathrm{cm} . ) They are placed in contact with curved surface towards each other and the space between them is filled with a liquid of refractive index ( 4 / 3 . ) The focal length of the system is : ( mathbf{A} cdot 48 mathrm{cm} ) в. ( 72 mathrm{cm} ) ( mathbf{c} cdot 12 c m ) D. ( 24 c m ) | 12 |

321 | The power of a lens having a focal length of ( 1 mathrm{cm} ) is : ( A cdot 1 D ) в. ( 10 D ) c. ( frac{1}{10} D ) D. ( 100 D ) | 12 |

322 | Based on this observation, state the conclusion which can be drawn about the constituents of white light. | 12 |

323 | Consider an equiconvex lens of radius of curvature ( boldsymbol{R} ) and focal length ( boldsymbol{f} ). If ( boldsymbol{f}> ) ( R, ) the refractive index ( mu ) of the material of the lens. A. Is greater than zero but less than 1.5 B. Is greater than 1.5 but less than 2.0 c. Is greater than 1.0 but less than 1.5 D. None of these | 12 |

324 | Assertion: The setting sun appears to be red. Reason: Scattering of light is directly proportional to the wavelength. A. both assertion and reason are true but the reason is the correct explanation of assertion B. both assertion and reason are true but the reason is not the correct explanation of assertion c. assertion is true but reason is false D. both the assertion and reason are false E. reason is true but assertion is false | 12 |

325 | A light ray falls on a mirror and deviates by ( 30^{circ}, ) then the angle of incidence will be: A .75 B. ( 60^{circ} ) ( c cdot 90 ) D. 180 | 12 |

326 | Two thin plano-convex lenses each of focal length ( f ) are placed as shown in the figure. The ratio of their effective focal lengths in the three cases is (i) (ii) A .1: 2: 3 B. 1: 2: 1 c. 1: 1: 1 D. 3: 2: 1 | 12 |

327 | Show that the minimum size of a plane mirror required to see the full image of an observer is half the size of that observer. | 12 |

328 | The change in focal length of an eye lens is caused by the action of A. pupil B. retina c. ciliary muscles D. iris | 12 |

329 | 83. A convex lens of focal length 10 cm is painted black at the o 2 mm middle portion as shown in figure. An object is placed at a 20 cm distance of 20 cm from the lens. Then, (a) only one image will be formed by the lens (b) the distance between the two images formed by such a lens is 6 mm (c) the distance between the images is 4 mm (d) the distance between the images is 2 mm | 12 |

330 | 71. A telescope of diameter 2 m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by this telescope is (a) 4 x 104 rad (b) 0.25 x 10° rad (c) 0.31 x 10 ºrad (d) 5.0 x 10- rad | 12 |

331 | As the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches: A. zero В . ( 45^{circ} ) ( mathrm{c} cdot 90^{circ} ) D. ( 180^{circ} ) | 12 |

332 | A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incident is ( 45^{0} ) and that of refraction is ( 30^{0} . ) The refractive index of the medium with respect to air is: A .2 в. ( frac{1}{sqrt{2}} ) c. ( 2 sqrt{2} ) D. ( sqrt{2} ) | 12 |

333 | Explain the reason which ray of light wil be transmitted through the face ( A B ) the refractive index of the prism for red, green, blue are ( 1.39,1.42,1.47 ? sin ) ( mathbf{7 1}=mathbf{4 6}^{circ}, sin . mathbf{7 0}=mathbf{4 4}^{circ}, operatorname{sin.67}=mathbf{4 2}^{circ} ) | 12 |

334 | A virtual image is A. always erect B. either erect or inverted C . always inverted D. neither erect nor inverted | 12 |

335 | State whether true or false: A concave lens forms a magnified or diminished image depending on the distance of object from it. A. True B. False | 12 |

336 | A disease, in which eye lens become cloudy and the opaque lens is removed and a new artificial lens is inserted, is : A. hypermetropia B. astigmatism c. cataract D. near-sightedness | 12 |

337 | When light is reflected from the a spherical or curved surface: A. the laws of reflections are followed B. the laws of reflections are not followed C. the laws of reflections may or may not be followed D. one of the laws is followed, the other is not | 12 |

338 | The magnification produced by a mirror is ( frac{1}{3} ) then the type of mirror is A. Concave B. convex c. Plane D. Planar | 12 |

339 | A compound microscope consists of two convex lenses of focal length ( 2 mathrm{cm} ) and ( 5 mathrm{cm} . ) When an object is kept at a distance of ( 2.1 mathrm{cm} ) from the objective, a virtual and magnified image is formed ( 25 mathrm{cm} ) from the eye piece. Calculate the magnifying power of the microscope. | 12 |

340 | If angle of minimum deviation of a prism is equal to refracting angle of the prism, then refractive index ( mu ) of material of prism satisfies A. ( 1<mu<sqrt{2} ) в. ( 2<mu<3 ) c. ( sqrt{2}<mu<2 ) D. ( 1<mu<sqrt{3} ) | 12 |

341 | Give a demonstration for total internal reflection. What are the technological applications of total internal reflection in nature? Briefly explain it. | 12 |

342 | What will be the critical angle of water if ( _{a} mu_{w}=frac{4}{3} ) A ( cdot 42 ) B . ( 49^{circ} ) ( c cdot 22 ) D. 1 | 12 |

343 | The glancing angle of incidence is ( 10^{circ} ) What will be the glancing angle of reflection? A ( .10^{circ} ) B. ( 80^{circ} ) c. ( 170^{circ} ) D. ( 60^{circ} ) | 12 |

344 | Assertion A reflecting type telescope is preferred in astronomy Reason Weight of the mirrors are less as compare the lenses. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 12 |

345 | When an object is placed on the principal axis of a convex lens at two different positions, it produces the images with magnification +2 and -4 respectively. How many times more away from the lens the image will be formed in the second position as compared to the first position? ( A cdot 2 ) B. 4 ( c cdot 5 ) D. 10 | 12 |

346 | State whether true or false: Rainbow is produced by the dispersion of sunlight by tiny raindrops in the air. A. True B. False | 12 |

347 | A ( 4.0 mathrm{cm} ) high object is placed at a distance of ( 60 mathrm{cm} ) from a concave lens of focal length ( 20 mathrm{cm} . ) Find the size of the image. | 12 |

348 | Explain the refection of transverse and longitudinal waves from a denser medium and a rarer medium. | 12 |

349 | A spherical mirror has radius of curvature equal to ( 50 mathrm{cm} ). Find the value of focal length. ( mathbf{A} cdot 50 mathrm{cm} ) B. ( 30 mathrm{cm} ) ( mathrm{c} cdot 25 mathrm{cm} ) D. ( 100 mathrm{cm} ) | 12 |

350 | The part of human eye which is sensitive to red, blue and green light is: A. retina B. lens c. cornea D. iris | 12 |

351 | What is the other name (a) myopia (b) hypermetropia? | 12 |

352 | Rays of light fall on a glass plate of refractive index ( =sqrt{3} . ) If the angle between refracted ray and reflected ray is ( 90, ) the angle of incidence is : A . 90 B . 45 c. 135 D. 60 | 12 |

353 | How do you find the focal length of a concave mirror? | 12 |

354 | Soap bubble appears coloured due to the phenomenon of: A. Total internal feflection B. Interference by division of amplitude c. Interference by division of wavefront D. Diffraction of light | 12 |

355 | (a) Name any two phenomena of light which cause the formation of a rainbow. (b) A particular colour in the rainbow makes an angle of ( 42.7^{circ} ) with the line of vision. What is the colour? (c) What will be the shape of a rainbow when viewed from: ¡. Terrace of a house? ii. Aircraft flying very high. | 12 |

356 | A short linear object of length ( b ) lies along the axis of a concave mirror of focal length ( f ) at a distance ( u ) from the pole of the mirror. The size of the image is approximately equal to: ( A ) [ bleft(frac{u-f}{f}right)^{frac{1}{2}} ] в. [ bleft(frac{u-f}{f}right) ] ( c ) [ bleft(frac{f}{u-f}right)^{frac{1}{2}} ] D. [ bleft(frac{f}{u-f}right)^{2} ] | 12 |

357 | A soap bubble has a thickness of ( 100 n m ) and a refractive Index of 1.35 Given that the wavelength of red light is about ( 700 n m ) and that of blue light is ( 400 n m, ) what colour does the bubble appear to be at the point on its surface closest to an observer when it is illuminated by white light? A. White B. Black c. Red D. Green | 12 |

358 | Which of the following are common to images formed by both Concave and Convex lens? A. Real and Inverted B. Real and Erectedd c. virtual and Erected D. Virtual and Real | 12 |

359 | A concave mirror cannot be used as a: A. torch reflector B. dentist’s mirror c. rear view mirror D. magnifying mirror | 12 |

360 | An object (O) is placed in a medium M of refractive index ( 5 / 3 ). A convex lens of focal length ( 15 mathrm{cm} ) is placed in front of the object as shown in the figure. Determine the position of the image formed by the lens. ( A cdot 15 mathrm{cm} ) B. 20 cm c. 30 ( mathrm{cm} ) D. ( 60 mathrm{cm} ) | 12 |

361 | What are the two possible reasons that cause this defect? | 12 |

362 | A ray of light travelling in air falls on the surface of a rectangular slab of a plastic material whose refractive index is ( 1.6 . ) If the incident ray makes an angle of ( 53^{circ} ) with the normal ( left(sin 53^{circ}=4 / 5right) ) find the angle made by the refracted ray with the normal. | 12 |

363 | Which of the following statements is true? A. The angle of incidence is twice the angle of reflection B. Angle of incidence + Glancing angle of incidence ( =90^{circ} ) C. Some types of virtual images can be caught on the screens. D. A convex mirror forms real image | 12 |

364 | Braille system are based on: A. tasting B. hearing c. touching D. smelling | 12 |

365 | If an equiconvex lens is cut into two halves along (i) ( X O X^{prime} ) and (ii) ( Y O Y^{prime} ) as shown in the figure. Let ( f, f^{prime}, f^{prime prime} ) be the focal lengths of complete lens of each, in case (i) and of each half in case (ii) respectively. Choose the correct statement from the following? ( mathbf{A} cdot f^{prime}=f, f^{prime prime}=f ) B . ( f^{prime}=2 f, f^{prime prime}=2 f ) C. ( f^{prime}=f, f^{prime prime}=2 f ) D. ( f^{prime}=2 f, f^{prime prime}=f ) | 12 |

366 | Arrange the following combinations in the increasing order of focal length: a) Two plano convex lenses of focal lengths ( 20 mathrm{cm} ) and ( 30 mathrm{cm} ) in contact. b) Two convex lens of focal lengths 20 ( mathrm{cm} ) and ( 10 mathrm{cm} ) in contact. c) Two convex lenses of focal length 25 ( mathrm{cm} ) separated by ( 5 mathrm{cm} ) ( A cdot a, b, c ) B. b, a, c ( c cdot a, c, b ) D. ( c, a, b ) | 12 |

367 | When light splits after passing through a glass prism into seven colours, the phenomenon is called: A. reflection of light B. refraction of light c. dispersion of light D. specturm | 12 |

368 | A square card of side length ( 1 mathrm{mm} ) is being seen through a magnifying lens of focal length ( 10 mathrm{cm} . ) The card is placed at a distance of ( 9 mathrm{cm} ) from the lens. The apparent area of the card through the lens is ( mathbf{A} cdot 1 mathrm{cm}^{2} ) B. ( 0.81 mathrm{cm}^{2} ) c. ( 0.27 mathrm{cm}^{2} ) D. ( 0.60 mathrm{cm}^{2} ) | 12 |

369 | A convex lens is given, for which the minimum distance between an object and its rel image is ( 40 mathrm{cm} . ) An object is placed at a distance of ( 15 mathrm{cm} ) from this lens. The liner magnification of adjustment will be A ( cdot frac{5}{3} ) B. – 2 ( c cdot 2 ) D. | 12 |

370 | When light travels from optically denser medium to optically rarer medium after refraction A. ( m m<r )в. ( m<i<m<r ) ( mathbf{c} cdot m<i=m<r ) ( mathbf{D} cdot m<i geq m<r ) | 12 |

371 | A person with a normal near point (25 ( mathrm{cm} ) ) using a compound microscope with objective of focal length ( 8.0 mathrm{mm} ) and an eyepiece of focal length ( 2.5 mathrm{cm} ) can bring an object placed at ( 9.0 mathrm{mm} ) from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope. | 12 |

372 | What do you mean by ‘Reflection of light’? State the laws of reflection. | 12 |

373 | The film of camera is compared to which part of human eye? A. Lens B. Retina c. Iriss D. choroid | 12 |

374 | The focal length of a concave mirror is ( 50 mathrm{cm} ) where an object is to be placed so that its image is two times magnified, real and inverted: A. ( 75 mathrm{cm} ) B. 72 cm ( c cdot 63 mathrm{cm} ) D. 50 cm | 12 |

375 | Secondary rainblow in the atmosphere ¡s: A. the result of polarization and dispersion of light B. brighter than the primary rainbow C. due to the phenomenon of double refraction D. formed with red colour on the top E. formed due to two reflections in the rain drop | 12 |

376 | A ( 1 mathrm{cm} ) height needle is placed at a distance of ( 0.1 ~ m ) from a convex mirror of focal length 0.05 m, then size of the image is A. ( 1 mathrm{cm} ) в. ( 0.66 mathrm{cm} ) ( mathrm{c} .0 .33 mathrm{cm} ) D. ( 0.5 mathrm{cm} ) | 12 |

377 | The angle of incidence on a plane mirror is ( 45^{circ}, ) then the angle of reflection will be A . 35 B . 45 ( mathrm{c} cdot 135^{circ} ) D. 145 | 12 |

378 | A man of height ( 170 mathrm{cm} ) wants to see his complete image in a plane mirror (while standing). His eyes are at a height of ( 160 mathrm{cm} ) from the ground. A. minimum length of the mirror ( =80 mathrm{cm} ) B. minimum length of the mirror = 85 cm c. bottom of the mirror should be at a height 80 cm or more D. bottom of the mirror should be at a height ( 85 mathrm{cm} ) | 12 |

379 | Why are red coloured lights are used in traffic signals to stop the vehicles? A. minimum wavelength and less scatter. B. maximum wavelength and more scatter. c. maximum wavelength and less scatter. D. less wavelength and less scatter. | 12 |

380 | In a glass prism, spectrum is produced due to : A. refraction B. dispersion c. scattering D. diffraction | 12 |

381 | A man uses a concave mirror for shaving. He keeps his face at a distance of ( 25 mathrm{cm} ) from the mirror and gets an image which is 1.4 times enlarged. Find the focal length of the mirror. | 12 |

382 | A ray of light suffers refraction through equilateral prism. The deviation produced by the prism does not depend on the : A. angle of incidence B. colour of light. c. material of prism. D. size of prism | 12 |

383 | are drawn on light rays to show the direction in which light travels. A. RAYS B. ARROWS c. LINES D. LINE SEGMENTS | 12 |

384 | In the creation of rainbow, the process occurs in which of the following order? A. reflection, refraction, dispersion and total internal reflection B. refraction, reflection, dispersion and total internal reflection C. dispersion, refraction, reflection and total internal reflection D. total internal reflection, refraction, dispersion and reflection | 12 |

385 | What is an object, that reflects some light and transmits some light, called? A . Coloured в. ०раяче c. Diffuse D. Translucent | 12 |

386 | A convex lens is used to form an image of an object on a screen, If the upper half of the lens is blackened so that it becomes opaque.Then: A. Only half of the image will be visible B. The image position shifts towards the lens c. The image position shifts away from the lens D. The brightness of the image reduces | 12 |

387 | The value of numerical aperature of the objective lens of a microscope is ( 1.25 . ) If light of wavelength ( 5000 dot{A} ) is used, the minimum separation between two points, to be seen as distinct, will be : A ( .0 .24 mu m ) в. ( 0.48 mu m ) c. ( 0.12 mu ) m D. ( 0.38 mu m ) | 12 |

388 | A ray of light is normally incident on one face of an equilateral glass prism. Will the light ray suffer minimum deviation by the prism? A . True B. False | 12 |

389 | Looming’ in polar region ( A cdot ) Is an optical illusion B. Arise due to the veriation of refractive index of atmosphere C. Is an example of total internal reflection D. All of the above | 12 |

390 | 13. A thin glass (refractive index 1.5) lens has optical power of -5 D in air. Its optical power in a liquid medium is (a) 10 (b) -25 D (c) 25 D (d) -1D (AIEEE 2005) | 12 |

391 | A spectrum is obtained by sending a beam of white light through a prism. ( mathbf{A} ) second prism exactly similar to the first one is placed in an inverted position with the sides parallel to the first. Now A. A new spectrum will be formed on the screen with double the number of colours present in the previous spectrum B. New spectrum will be obtained on the screen with only half the number of colours present in the previous spectrum C. Previous spectrum will disappear and we will obtain a white light formed by the fusion of the colours D. A spectrum with same number of colours present in the previous spectrum will be formed but their wave lengths will be increased twice | 12 |

392 | A concave lens forms the image of an object such that the distance between the object and image is ( 10 mathrm{cm} ) and the magnification produced is ( 1 / 4 . ) The focal length of the lens will be ( mathbf{A} cdot 8.6 mathrm{cm} ) B. ( 6.2 mathrm{cm} ) c. ( 10 mathrm{cm} ) D. ( 4.4 mathrm{cm} ) | 12 |

393 | Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? A. Dispersion of light B. Scattering of light c. Total internal reflection of light D. Reflection of light from the earth | 12 |

394 | When an equilateral glass prism is in minimum deviation position, (A) the refracted ray is parallel to the base of the prism (B) the angle of incidence is equal to the angle of emergence. Choose the correct option. A. Only A is true B. Only B is true c. Both A and B are true D. Both A and B are false | 12 |

395 | The power of a lens is -5 D. Find its focal length. | 12 |

396 | (a) State Snell’s law for refraction of light. (b) A concave mirror forms two times magnified and real image of an object placed at ( 15 mathrm{cm} ) from its pole. Determine the distance of image from mirror and focal length of the mirror. | 12 |

397 | Three observers ( A, B ) and ( C ) measure the speed of light coming from a source to be ( boldsymbol{v}_{A}, boldsymbol{v}_{B} ) and ( boldsymbol{v}_{C} . ) The observer ( boldsymbol{A} ) moves towards the source and ( C ) moves away from the source at the same speed. The observer ( boldsymbol{B} ) stays stationary. The surrounding space is vacuum everywhere. This question has multiple correct options ( mathbf{A} cdot v_{A}>v_{B}>v_{C} ) В . ( v_{A}<v_{B}<v_{C} ) ( mathbf{c} cdot v_{A}=v_{B}=v_{C} ) D. ( v_{B}=frac{1}{2}left(v_{A}+v_{C}right) ) | 12 |

398 | A microscope in which maximum magnification is achieved, but the object cannot be seen by eye is called A. simple microscope B. Dissecting microscope c. Electron microscope D. Phase contrast microscope E. Compound microscope | 12 |

399 | image of an object approching a convex mirror of radius of curvature ( 20 mathrm{m} ) along its optical axis so is observed to move from ( frac{25}{3} m ) to ( frac{50}{7} m ) into 30 s. what is the speed of the object in ( K m / h ? ) A . 3 B. 4 ( c .5 ) D. 6 | 12 |

400 | Fill in the blank with appropriate answer: A compound microscope is used because a realistic simple microscope | 12 |

401 | What are the colours of the Sun observed most during sunrise/sunset and noon? A. white and red B. reddish and orange c. yellow and reddish D. orange and blue | 12 |

402 | An equiconvex lens is made from glass of refractive index ( 1.5 . ) If the radius of each surface is changed from 5 ( mathrm{cm} ) to ( 6 c m, ) then the power: A. Remains unchanged B. Increases by 3.33 D c. Decreases by 3.33 D D. Decreases by ( 5.5 D ) | 12 |

403 | If an object of ( 10 mathrm{cm} ) height is placed at a distance of ( 36 mathrm{cm} ) from a concave mirror of focal length ( 12 mathrm{cm} ), find the position, nature and height of image. | 12 |

404 | A compound microscope has a magnification 30. The focal length of eyepiece is ( 5 mathrm{cm} . ) Assuming that the final image is formed at least distance of distinct vision ( (25 mathrm{cm}) ). Find the magnification produced by objective. | 12 |

405 | In hypermetropia, the image of near object is formed: A. Before the retina B. On retina c. Behind the retina D. Above the retina | 12 |

406 | A point source of light at the surface of a sphere causes a parallel beam of light to emerge from the opposite surface of the sphere. The refractive index of the material of the sphere is? A . 5 В. ( 5 / 3 ) c. 2 D. 2.5 | 12 |

407 | An unnumbered wall clock shows time ( 04: 25: 37, ) where ist term represents hours, 2nd represents minutes and the last term represents seconds. What time will its image in a plane mirror show ( mathbf{A} cdot 08: 35: 23 ) B. ( 0 .: 35: 23 ) c. 07: 35: 23 D. none of these | 12 |

408 | The spreading of white light into its component colours is known as. A. Dispersion B. Deviation c. Refraction D. Diffraction | 12 |

409 | In the image formed by a plane mirror, the left of the object appears on the right and the right appears on the left. This is called lateral inversion. A . True B. False | 12 |

410 | If the focal lengths of objective and eyelens of a microscope are ( 1.2 mathrm{cm} ) and ( 3 mathrm{cm} ) respectively and the object is put ( 1.25 mathrm{cm} ) away from the objective lens and the final image is formed at infinity, then magnifying power of the microscope is A . 150 B. 200 c. 250 D. 400 | 12 |

411 | An object is placed in front of a thin convex lens of focal length ( 30 mathrm{cm} ) and a plane mirror is placed ( 15 mathrm{cm} ) behind the lens. If the final image of the object coincides with the object, the distance of the object from the lens is : ( A cdot 60 mathrm{cm} ) B. 30 cm c. ( 15 mathrm{cm} ) D. 25 cm | 12 |

412 | The objective and eyepiece of an astronomical telescope are doubled convex lenses with refractive index 1.5 When the telescope is adjusted to infinity, the separation between the two lenses is ( 16 mathrm{cm} ). If the space between the lenses is now filled with water and again telescope is adjusted for infinity, then the present separation between the lenses is: A. ( 8 mathrm{cm} ) в. 16 ст ( c cdot 24 c m ) D. 32 ст | 12 |

413 | Assertion The refractive index of a prism depends only on the kind of glass of which it is made of and the colour of light. Reason The refractive index of a prism depends on the refracting angle of the prism and the angle of minimum deviation. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

414 | Some stars appear red in colour and some blue in colour. Which one of the statements is true? A. Star with blue colour has more temperature than red colour star B. Temperature of blue colour star is less than red colour star c. There is no relation between colour of the star and temperature D. Blue colour star and red colour star has equal temperature | 12 |

415 | 21. An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50, is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film? (a) 7.2 m (b) 2.4 m (c) 3.2 m (d) 5.6 m (AIEEE 2012) | 12 |

416 | Mark the INCORRECT statement: A. Light travels along a straight line B. A mirror does not change the medium of light falling on it C. Things are only visible when light from our eyes reaches the object D. All visible things either reflect or emit light | 12 |

417 | Which colour deviate minimum during the dispersion of light through a prism? | 12 |

418 | A ray of light falls on the surface of a spherical glass paperweight making an angle ( a ) with the normal and is refracted in the medium at angle ( b ). The angle of deviation of the emergent ray from the direction of incident ray is : A ( . a-b ) в. ( 2(a-b) ) c. ( frac{(a-b)}{2} ) D. ( b-a ) | 12 |

419 | The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as A. Reflection B. Refraction c. Dispersion D. None | 12 |

420 | A card sheet divided into squares each of size ( 1 mathrm{mm}^{2} ) is being viewed at a distance of ( 9 mathrm{cm} ) through a magnifying glass (a converging lens of focal length ( 9 mathrm{cm} ) ) held close to the eye.(a) What is the magnification produced by the lens? How much is the area of each square in the virtual image?(b) What is the angular magnification (magnifying power) of the lens?(c) Is the magnification in (a) equal to the magnifying power in (b)? Explain | 12 |

421 | When a ray of light strikes a plane mirror along the normal, the angle of incidence is – A . ( 90^{circ} ) B. zero ( c cdot 45 ) D. none of these | 12 |

422 | Concave lens is used to correct A. Myopia B. Presbiopia C. Hypermetropia D. cataract | 12 |

423 | Which of the following statements are true? a. The spectrum of sunlight has 7 colors b. Spectrum is seen due to bending of lights of different colors at different angles with respect to the incident ray through a prism c. Red light bends the least whereas violet light bends the maximum d. Rainbow is an example of dispersion of light A. a, band c B. c and d c. a, c and d D. All of these | 12 |

424 | Rainbow is an example of dispresion of sunlight.Expalin its formation. | 12 |

425 | State whether the given statement is True or False. The front portion of the eye is filled with vitreous humour. | 12 |

426 | If the radius of curvature of a spherical mirror is ( 20 mathrm{cm}, ) then its focal length is ( mathrm{cm} ) A . 20 B. 40 c. 10 D. None of these | 12 |

427 | Explain how you can take care of your eyes. | 12 |

428 | Power of a lens can’t be measured in A. ( m ) B. ( W ) c. Horse power D. None of these | 12 |

429 | Refraction index of water is ( 4 / 3 ) Calculate speed of light in water. A ( cdot 3 times 10^{8} m / s ) В. ( 62 m / s ) C ( .2 .25 times 10^{8} mathrm{m} / mathrm{s} ) D. 1.25 | 12 |

430 | Establish the formula ( frac{1}{boldsymbol{f}}=frac{1}{boldsymbol{u}}+frac{1}{boldsymbol{v}} ) for ( mathbf{a} ) concave mirror, where symbols have their usual meanings. | 12 |

431 | (a) Draw a ray diagram showing the image formation by a compound microscope. Hence obtain expression for total magnification when the image is formed at infinity (b) Distinguish between myopia and hypermetropia. Show diagrammatically how these defect can be corrected. | 12 |

432 | Fill in the blanks: Light is a form of that we detect with our A. energy, ears B. corpuscles, eyes c. energy, eyes D. sensation, skin | 12 |

433 | An achromatic combination of concave and convex lens has power 5 D. If the power of convex lens is 4 D, then the magnitude of focal length of concave lens is? | 12 |

434 | Cilliary muscles in the eye: A. hold the eye lens in place B. increase or decrease focal length of eye lens. C. both (a) and (b) D. none of these | 12 |

435 | Speed of light is maximum in: A. glass B. vaccumm c. water D. nylon | 12 |

436 | The Speed of light in vacuum is: A ( cdot 2 times 10^{10} mathrm{m} / mathrm{s} ) B . ( 3 times 10^{8} mathrm{m} / mathrm{s} ) c. ( 4 times 10^{5} mathrm{m} / mathrm{s} ) D. ( 2 times 10^{12} mathrm{m} / mathrm{s} ) | 12 |

437 | Match the statements in Column A, with those in Column B. | 12 |

438 | Four lenses of focal length ( +15 c m,+20 c m,+150 c m ) and ( +250 c m ) are available for making an astronomical telescope. To produce the largest magnification, the focal length of the eyepiece should be A ( .+15 mathrm{cm} ) B. +20 cm ( mathbf{c} .+150 mathrm{cm} ) D. ( +250 c m ) | 12 |

439 | Figure shown a spherical concave mirror with its pole at (0,0) and principal axis along x axis. There is a point object at ( (-40 mathrm{cm}, 1 mathrm{cm}), ) find the position of image. | 12 |

440 | Write the structure of eye lens and state the role of ciliary muscle in the human eye | 12 |

441 | A ray of light is normally incident on one face of an equilateral glass prism. What is the angle of refraction from the first face of the prism? A ( .90^{circ} ) B . ( 45^{circ} ) ( c cdot 30^{circ} ) D. ( 0^{circ} ) | 12 |

442 | State the cause of dispersion of white light by a glass prism. How did Newton, using two identical glass prisms, show that white light is made of seven colors? Draw a ray diagram to show the path of a narrow beam of white light, through a combination of two identical primes arranged together in inverted position with respect to each other, when it is allowed to fall obliquely on one of the faces of the first prism of the combination. | 12 |

443 | The edge formed by the two refracting surfaces is the refracting edge in glass prism. Is this statement True or False? A. True B. False | 12 |

444 | The curvature of the eye lens can be modified by A. ciliary muscles B. iriss c. pupil D. cornea | 12 |

445 | Formation of real image using a biconvex lens is shown below: f the whole set up is immersed in water without disturbing the object and the screen position, what will one observe on the screen? A. Image disappears B. No change C. Erect real image D. Magnified image | 12 |

446 | A parallel narrow beam of light is incident on the surface of a transparent hemisphere of radius ( boldsymbol{R} ) and refractive index ( mu=1.5 . ) The position of the image formed by refraction at the spherical surface only is A. ( R / 2 ) B. ( 3 R ) ( c . R / 3 ) ( mathbf{D} cdot 2 R ) | 12 |

447 | With the help of a diagram explain the formation of rainbow in the sky. List two essential conditions for observing a rainbow | 12 |

448 | The absolute refractive index of glass and water are ( 3 / 2 ) and ( 4 / 3, ) respectively. If the speed of light in glass is ( 2 times 10^{8} ) ( mathrm{m} / mathrm{s}, ) calculate the speed of light in : (a) vacuum (b) water | 12 |

449 | The constant ratio of the sine of angle of incidence to the sine of angle of refraction is also known as: A. Snell’s law B. Optical density c. Relative density D. None of these | 12 |

450 | Light of wavelength ( lambda_{1} ) enters a medium with refractive index ( n_{2} ) from a medium with refractive index ( n_{1} ). What is the wavelength of light in second medium? | 12 |

451 | A ray of light passes through an equilateral prism (refractive index ( = ) 1.5) such that the angle of incidence is equal to the angle of emergence and the latter is equal to ( 3 / 4 ) th the angle of the prism. The angle of deviation is: A ( .20^{circ} ) B. ( 39^{circ} ) c. ( 5^{circ} ) D. ( 30^{circ} ) | 12 |

452 | A spherical convex surface of radius of curvature ( R ) separates ( operatorname{air}left(mu_{a}=1right) ) from ( operatorname{glass}left(a mu_{g}=1.5right) . ) The centre of curvature is in the glass. A point object P placed in air is found to have a real image ( Q ) in the glass. The line PQ cuts the surface at a point 0 and ( P 0=0 Q ) The distance PO is equal to A. 5R B. 3R ( c cdot 2 R ) D. 1.5 R | 12 |

453 | A microscope consists of an objective with a focal length ( 2 mathrm{mm} ) and an eye piece with a focal length ( 40 mathrm{mm} ). The distance between the foci (which are between the lenses) of objective and eyepiece is ( 18 mathrm{cm} . ) The total magnification of the microscope is (Consider normal adjustment and take ( mathrm{D}=25 mathrm{cm} ) A . 562.5 B. 625 c. 265 D. 62.5 | 12 |

454 | Height of the image of an principal axis produced by a convex lens is double the object height. If the focal length of the lens is ( 20 mathrm{cm} ), then the image distance from lens is : ( mathbf{A} cdot 10 mathrm{cm} ) B. ( 30 mathrm{cm} ) ( mathbf{c} cdot 40 mathrm{cm} ) D. Both (1)( &(2) ) | 12 |

455 | When a light ray falls on a perfectly reflective mirror at an angle. Identify which of the following statement is true about the ray? A. The frequency of the light ray changes B. The wavelength of the light ray changes C. The velocity of the light ray changes D. The period of the light ray changes E. The direction of motion of the light ray changes | 12 |

456 | What will be the effect of refraction on a lemon, when it is placed in a glass tumbler filled with water? A. It will appear smaller than the actual size B. It will appear bigger than the actual size c. It will be invisible D. It will appear raised | 12 |

457 | A ( 1.2 c m ) long pin is placed perpendicular to the principal axis of a convex mirror of focal length ( 12 mathrm{cm}, ) at a distance of ( 8 mathrm{cm} ) from it. Find the location of the image. Find the height of the image. | 12 |

458 | The power of a convex lens of focal length 2 metre will be: A ( .+0.5 D ) в. ( +5 D ) ( mathrm{c} cdot+50 D ) D. – 5D | 12 |

459 | Riya and Priya were sitting around a round table. They noticed that they could see their own and each other’s image onto the table top. Then table top is made of A. Unpolished wood, covered with white cloth B. Polished glass of red colour C. Glass covered with cellophane paper D. Smoked glass covered with green colour cloth. | 12 |

460 | A person cannot clearly see objects farther than ( 12 mathrm{m} ) from the eye. Name the defect in vision he is suffering from and the lens that should be used to correct this defect. | 12 |

461 | The most effective resource for visually challenged person is A. Telescopic aid B. Auditory aid c. Lenses D. Braille system | 12 |

462 | When we see an object, the image formed on the retina is (i) real (ii) virtual(iii) erect (iv) inverted A. (i) and (iv) only B. (i), (ii), (iii) c. (iv) only D. (ii) and (iv) | 12 |

463 | The lens used to correct long sightedness or hypermetropla. A. Convex lens B. Concave lens c. simple lens D. Cylindrical lens | 12 |

464 | A horizontal parallel beam of light passes through a vertical convex lens of focal length ( 20 mathrm{cm} ) and is then reflected by a titled plane mirror so that it coverages to a point I. The distance Pl is ( 10 mathrm{cm} ) M is a point at which the axis of the lens intersects the mirror. The distance PM is ( 10 mathrm{cm} . ) The angle which the mirror makes with the horizontal is ( mathbf{A} cdot 15^{circ} ) B. ( 30^{circ} ) ( mathbf{c} cdot 45^{circ} ) D. ( 60^{circ} ) | 12 |

465 | An infinitely long rod lies along the axis of a concave mirror of focal length ( f ). The near end of the rod is at a distance ( u> ) ( f ) from the mirror. Its image will have a length : ( mathbf{A} cdot f^{2} /(u-f) ) B. ( u f /(u-f) ) c. ( f^{2} /(u+f) ) D. ( u f /(u+f) ) | 12 |

466 | An upright object is placed at a distance in front of a converging lens equal to twice the focal length ( 20 mathrm{cm} ) of the lens. On the other side there is a concave mirror of focal length ( 15 mathrm{cm} ) separated from thelens by a distance of 70 cm. Then select the correct statements from the following his question has multiple correct options A. Magnification for the system is ( 1 / 2 ) B. Magnification for the system is c. Final image by the system will real and at distance of ( 80 mathrm{cm} ) from centre of curvature of spherical mirror ification for the system is ( +1 / 2 ) | 12 |

467 | Reflection is A. Bending of ray of light. B. Bouncing back of ray of light. C. Light travelling in a straight line. D. None of these. | 12 |

468 | A broader bundle of light rays is called a A. Beam of light B. Ray of light c. Bundle of light D. None of these | 12 |

469 | The angle between incident ray and normal is ( 30^{circ}, ) then the angle of incidence will be A ( .60^{circ} ) B. ( 30^{circ} ) ( c .90^{circ} ) D. 150 | 12 |

470 | What happen to the image, if a convex lens is made up of two different transparent material, as shown in figure? | 12 |

471 | In an astronomical telescope the focal lengths of objective and eyepiece should respectively be : A. large and small B. small and large c. equal D. too small are too large | 12 |

472 | Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection? | 12 |

473 | A glass prism of refractive index 1.5 is immersed in water of refractive index 4/3. A light ray incident normally on face ( A B ) is totally reflected at face ( A C ) if ( mathbf{A} cdot sin theta>8 / 9 ) B. ( sin theta<2 / 3 ) ( c cdot sin theta=sqrt{3} / 2 ) D. ( 2 / 3<sin theta leq 8 / 9 ) | 12 |

474 | A candle flame ( 3 mathrm{cm} ) high is placed at a distance of ( 3 mathrm{m} ) from a wall.how far from the wall must a concave mirror be placed so that it may form ( 9 mathrm{cm} ) high image of the flame on the same wall? Also find the focal length of the mirror. | 12 |

475 | A beam of white light traveling in medium ( A ) strikes the interface to another transparent medium, medium B. If the speed of white light is less in medium ( B ) than in medium ( A ), the beam will A. refract toward the normal B. refract away from the normal c. undergo total internal reflection D. have an angle of reflection smaller than the angle of incidence E. have an angle of reflection greater than the angle of incidence | 12 |

476 | 42. You are given two identical plano- convex lenses. When you place an object 20 cm to the left of a single plano-convex lens, the image appears 40 cm to the right of the lens. You then arrange the two plano-convex Plano- Double lenses back to back to form a double convex convex convex lens. If the object is 20 cm to the left of this new lens, what is the approximate location of the image? (a) 10 cm to the right of the lens (b) 20 cm to the right of the lens (c) 80 cm to the right of the lens (d) 80 cm to the left of the lens | 12 |

477 | A ( 4 mathrm{cm} ) tall object is placed perpendicular to the principal axis of a convex lens of focal length ( 24 mathrm{cm} . ) The distance of the object from the lens is 16 cm. Find the position, size and nature of the image formed, using the lens formula. | 12 |

478 | A ray of light is incident on a glass slab of refractive index ( 1.52 . ) if the reflected and refracted rays of light are mutually perpendicular to each other then the angle of incidence will be A ( .90^{circ} ) B . ( 60^{circ} ) c. ( 56^{circ} ) 40 D cdot ( 19^{circ} 58^{prime} ) | 12 |

479 | A magnifying glass is used to read the newspaper. As it is moved far away from the newspaper A. Text becomes blurred and magnification reduces B. Text becomes more focussed and magnification reduces c. Text becomes more focused and magnification increases D. Text becomes blurred and magnification increases | 12 |

480 | What is the refractive index of a prism whose angle ( A=60^{circ} ) and angle of minimum deviation ( boldsymbol{d}_{m}=mathbf{8 0}^{o} ? ) A ( cdot sqrt{2} ) B. ( sin ^{-1}(sqrt{3}) ) ( mathbf{c} cdot tan ^{-1}(sqrt{2}) ) D. ( tan ^{-1}(sqrt{3}) ) | 12 |

481 | 13. To find index error for u, when a knitting needle of length 20.0 cm is adjusted between pole and object needle, the separation between the indices of object needle and mirror was observed to be 20.2 cm. Index correction for u is (a) -0.2 cm (b) 0.2 cm (c) -0.1 cm (d) 0.1 cm Sal (hl Indey error (Y ordina | 12 |

482 | An ideal mirror: A. Absorbs all the amount of light incident on it B. Refracts all the light C. Reflects all the light D. None of the above | 12 |

483 | The focal length of a convex lens is ( 25 mathrm{cm} . ) Find its power with sign. ( A cdot+4 D ) в. ( -4 D ) ( c .+2.5 D ) D. ( -2.5 D ) | 12 |

484 | Which of the following is Snell’s law? A ( cdot n_{1} sin i=frac{sin r}{n_{2}} ) B. ( frac{n_{1}}{n_{2}}=frac{sin r}{sin i} ) c. ( frac{n_{2}}{n_{1}}=frac{sin r}{sin i} ) D. ( n_{2} sin i= ) constant | 12 |

485 | Blue colour of sky is due to: A. scattering. B. absorption. c. reflection. D. refraction. | 12 |

486 | In secondary rainbow what is the order of colours observed from earth? A. Violet innermost, Red outermost B. Red innermost, Violet outermost c. Random D. White and dark alternatively | 12 |

487 | Derive the relationship between the focal length and radius of curvature of spherical mirror. | 12 |

488 | (a) A mobile phone lies along the principal axis of a concave mirror. Show, with the help of a suitable diagram, the formation of its image. Explain why magnification is not uniform. (b) Suppose the lower half of the concave mirror’s reflecting surface is covered with an opaque material. What effect this will have on the image of the object? Explain. | 12 |

489 | A convex mirror used for rear view on an automobile has a radius of curvature of ( 3.00 mathrm{m} . ) If a bus is located at ( 5.00 mathrm{m} ) from this mirror, find magnification? ( A cdot+0.23 ) B. – -0.23 ( c cdot+0.45 ) D. -0.45 | 12 |

490 | A mark on the surface of a glass sphere( ( boldsymbol{mu}=1.5) ) is viewed from a diametrically opposite position. It appears to be at a distance ( 10 mathrm{cm} ) from its actual position. The radius of sphere is: A. ( 5 mathrm{cm} ) B. 10 ( mathrm{cm} ) c. ( 15 mathrm{cm} ) D. 20 cm | 12 |

491 | An object is placed in front of a spherical mirror whose 2 times magnified images is formed on the screen. Then choose the CORRECT option: A. Mirror is concave ( mathrm{m}=+2 ) B. Mirror is concave ( m=-2 ) c. Mirror is convex ( mathrm{m}=+2 ) D. Mirror is convex ( mathrm{m}=-2 ) | 12 |

492 | When a ray of light is incident normally on one refracting surface of an equilateral prism (Refractive index of the material of the prism ( =1.5 ) ) A . emerging ray is deviated by ( 30^{circ} ) B. emerging ray is deviated by 45 c. emerging ray just grazes the second refracting surface D. The ray undergoes total internal reflection at the second refracting surface | 12 |

493 | When the light is very bright, then: A. Iris makes pupil expand B. Iris makes pupil contract C. Iris and pupil remain as they are D. None of these | 12 |

494 | Which of the following statements is correct regarding the propagation of light of different colors of white light in air? A. Red light moves fastest B. Blue light moves faster than green light c. All the colours of the white light move with the same speed D. Yellow light moves with the mean speed as that of the red and the violet light | 12 |

495 | An object of ( 2 mathrm{cm} ) height is placed at a distance of ( 16 mathrm{cm} ) from a concave mirror which produces a real image ( -3 c m ) height. What is the focal length ( & ) position of the image? | 12 |

496 | The image which can not be taken on the screen is called A. a real image B. a virtual image c. either a real or a virtual image D. neither a real nor a virtual image | 12 |

497 | A ray of light takes grazing incidence on the first face of a prism and the emergent ray is normal to the ( 2^{n d} ) face of the prism. If ( mathrm{D} ) is angle of deviation then the refracting angle of the prism is equal to A ( cdot 90^{circ}-2 D ) B. ( 90^{circ}-D ) c. ( 90^{circ}-frac{D}{2} ) D. ( 180^{circ}-2 D ) | 12 |

498 | Who amongst the following used corpuscular theory to explain reflection and refraction of light? A. Newton B. Maxwell c. Young D. Hertz | 12 |

499 | occurs when a light ray bounces back from a barrier. A. Refraction B. Reflection c. Dispersion D. Scattering | 12 |

500 | Far point of a person is ( 5 m . ) In order that he has normal vision what kind of spectacles should be use A. Concave lens with focal length ( 5 m ) B. Concave lens with focal length ( 10 mathrm{m} ) c. convex lens with focal length ( 5 m ) D. Convex lens with focal length ( -2.5 mathrm{m} ) | 12 |

501 | The word ‘VIBGYOR’ is made of the initial letters of the seven colours of the A. Prism B. Red light c. shadow D. Rainbow | 12 |

502 | A ray of light is incident normally on one refracting surface of an equilateral prism. If the refractive index of the material of the prism is ( 1.5, ) then: A. the emergent ray is deviated by ( 30^{circ} ) B. the emergent ray is deviated by ( 60^{circ} ) C. the emergent ray just graces the second reflecting surface D. the ray undergoes total internal reflection at second refracting surface E. the ray emerges normally from the second refracting surface | 12 |

503 | Copy the diagram given below and complete the path of light ray till it emerges out of the prism. The critical angle of glass is ( 42^{circ} . ) In your diagram mark the angles wherever necessary. | 12 |

504 | 6. The graph shows variation of v with change in u for a mirror. Points plotted above the point P on the curve are for values of v (a) Smaller than / (b) Smaller than 21 (c) Larger than 21 (d) Larger than | 12 |

505 | Why are danger signals always red in color? A. Red light is least scattered by fog and smoke B. It is the color of danger c. Both A and B D. None of these | 12 |

506 | A concave mirror forms the image of an object on a screen. If the lower half of the mirror is covered with an opaque card, the effect would be to make the A. image less bright. B. lower half of the image disappear. c. upper half of the image disappear. D. image blurred. | 12 |

507 | Distinguish between: Convex mirror and concave mirror | 12 |

508 | In a compound microscope the intermediate image is : A. real, inverted & magnified B. real, erect & magnifiedd c. virtual, erect & magnified D. virtual, erect & reduced | 12 |

509 | A compound microscope has on objective of focal length ( 0.5 mathrm{cm} ) and a tube length of ( 15 mathrm{cm} . ) If it produces and angular magnification of 225 in normal adjustment, find the focal length of the eyepiece. A. ( 3.33 mathrm{cm} ) B. ( 15 mathrm{cm} ) c. ( 2.25 mathrm{cm} ) D. 3.5 cm | 12 |

510 | Name one property of waves that do not change when the wave passes from one medium to another | 12 |

511 | Microscopes are used for magnification: A. True B. False | 12 |

512 | In the case of plane mirror. from the mirror distance of the image ( = ) distance of the A. Second image B. object c. both D. none | 12 |

513 | Two thin similar convex glass pieces are joined together front to front, with its rear portion silvered such that a sharp image is formed 0.2 ( mathrm{m} ) for an object at infinity. When the air between the glass pieces is replaced by water ( left(mu=frac{4}{3}right), ) find the position of image. | 12 |

514 | left of a thin convex lens of focal length ( 30 mathrm{cm} . ) A convex spherical mirror of radius of curvature ( 100 mathrm{cm} ) is placed to the right of the lens at a distance of ( 50 mathrm{cm} . ) The mirror is titled such that the axis of the mirror is at a angle ( boldsymbol{theta}=mathbf{3 0}^{circ} ) to the axis of the lens, as shown in the figure. If the origin of the coordinate system is | 12 |

515 | A reflecting surface is curved outwards. The mirror formed will be : A. Concave B. Plane c. convex D. None of these | 12 |

516 | Myopia of the common defects of vision and the type of lens used to remove it. | 12 |

517 | The focal length of a symmetric biconvex lens is ( 20 mathrm{cm} ). If the refractive index of the material of the prism is 1.5 the radius of curvature of one of two surfaces is ( A cdot 10 mathrm{cm} ) B. 20 cm c. ( 40 mathrm{cm} ) D. 80 cm | 12 |

518 | Assertion A beam of light rays has been reflected from a rough surface. Reason Amplitude of incident and reflected rays would be different. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 12 |

519 | Red and blue beams of light is incident on a prism as shown in the figure. Which of the following statements is true? A. The blue light bends more than the red light as the blue light has a longer wavelength. B. The red light bends more than the blue light as the red light has a longer wavelength. C. The blue light bends more than the red light as the blue light has a shorter wavelength. D. The red light bends more than the blue light as the red light has a shorter wavelength. E. The red and blue lights bend by the same amount as all colors of light refract equally. | 12 |

520 | A biconvex lens has focal length of 25 cm. the radius of curvature of one the surface is double of the other. Find the radii. given ( mu_{l e n s}=1.5 ) A. ( 37.5 mathrm{cm}, 75 mathrm{cm} ) B. ( 18.75 mathrm{cm}, 37.5 mathrm{cm} ) ( c .7 .5 mathrm{cm}, 15 mathrm{cm} ) D. ( 15 mathrm{cm}, 30 mathrm{cm} ) | 12 |

521 | A compound microscope has an objective of focal length ( 2 mathrm{cm} ) and an eye-piece of focal length ( 6.25 mathrm{cm}, ) which are separated by 15 cm.fr the final image is formed at the least distance of distinct vision ( 25 mathrm{cm}, ) distance to the object from the objective is A. ( 20 mathrm{cm} ) B. 8.75 cm ( c .1 .50 mathrm{cm} ) D. 2.5 ( mathrm{cm} ) | 12 |

522 | State whether given statement is True or False During refraction through prism a ray bends away from its base. | 12 |

523 | Mark the statement which is true for diffused reflection: A. Diffused reflection is due to failure of laws of reflection B. It is caused due to irregularities in the reflecting surface c. When the incident light is diffused in nature it causes diffused reflection D. All are true | 12 |

524 | Which type of mirror is used by a dentist? A . Plane B. convex c. concave D. Both (b) and (c) | 12 |

525 | Study the following diagram carefully and then answer the questions that follow. The diagram is depicting a defect of the human eye. (i) Identify the defect shown in the diagram. (ii) Give two possible reasons for the above defect. (iii) Draw a neat labelled diagram to show how the above defect can be rectified. | 12 |

526 | A point object ( boldsymbol{O} ) is placed at a distance of ( 0.3 m ) from a convex lens (focal length ( 0.2 m ) ) cut into two halves each of which is displaced by ( 0.0005 m ) as shown in the figure. f this arrangement will generate more than one image, then what will be the total number of images? 4 B. ( c ) D | 12 |

527 | A light ray is travelling between two media as given below. The angle of incidence on the boundary in all the cases is ( 30^{circ} . ) Identify the sequence of increasing order of angles of refraction. a) Air to water b) Water to glass c) Glass to water ( A cdot a, b, c ) B. b, c, a ( c cdot c, a, b ) D. a, c, b | 12 |

528 | A light bulb burns in front of the center of a ( 40 mathrm{cm} ) wide plane mirror that is hung vertically on a wall. A man walks in front of the mirror along a line that is parallel to the mirror and twice as far from it as the bulb. The greatest distance he can walk and still see the image of the bulb. ( mathbf{A} cdot 20 mathrm{cm} ) B. ( 40 mathrm{cm} ) c. ( 60 mathrm{cm} ) D. ( 120 mathrm{cm} ) | 12 |

529 | An object of ( 2 mathrm{cm} ) height is placed at a distance of ( 10 mathrm{cm} ) from a concave mirror of radius of curvature ( 30 mathrm{cm} . ) Find the image distance, height and magnification. | 12 |

530 | A myopic person cannot see clearly: A. near objects B. objects placed at the least distance of distinct vision C. very far objects D. none | 12 |

531 | In the adjoining diagram,a wavelength AB, moving in air is incident on a plane glass surface XY. Its position CD after refraction through a glass slab is shown also along with the normals drawn at ( A ) and D. The refractive index of glass with respect to air ( (mu=1) ) will be equal to A. ( frac{sin theta}{sin theta^{prime}} ) B. ( frac{sin theta}{sin phi^{prime}} ) c. ( frac{sin phi^{prime}}{sin theta} ) ( D ) | 12 |

532 | A person needs a lens of power -4.5 D for correction of her vision. What is the focal length of the corrective lens? A. ( f=-0.25 mathrm{m} ) B. ( f=+0.22 mathrm{m} ) c. ( f=1.22 mathrm{m} ) D. ( f=-0.22 mathrm{m} ) | 12 |

533 | Which of the following phenomena is related to the formation of rainbows? This question has multiple correct options A . Reflection B. Refraction c. Dispersion D. Scattering | 12 |

534 | Which of the following statements is correct concerning the passage of white light into a glass prism? A. All the colours of white light travel with the same speed B. The violet colour travels slower than the red colour C. The violet colour travels faster than the red colour D. Greater the wavelength, slower the speed of colour | 12 |

535 | If two mirrors are inclined at some angle ( theta . ) An object is placed between the mirrors and there are 5 images formed for an object, then ( theta ) is may be A ( cdot 45^{circ} ) B. ( 53^{circ} ) ( c cdot 63^{circ} ) D. ( 75^{circ} ) | 12 |

536 | Fill in the blank: When the angle of incidence increases, glancing angle of reflection A. increases B. remains same c. decreases D. becomes infinite | 12 |

537 | The radius of curvature for a plane mirror is A. Positive B. Negative c. Infinite D. None of these | 12 |

538 | Choose the correct options. Having two eyes facilitates in: A. Increasing the field of view B. Giving 3 dimensional view C. Developing the concept of distance / size. A. A only B. A and B only c. B only D. ( A, B ) and ( C ) | 12 |

539 | Figure shows the ray diagram of a A. Simple microscope B. Compound microscope c. simple Telescope Compound Telescope | 12 |

540 | An air bubble in water shines because of the phenomenon of: A. reflection B. refraction c. diffraction D. total internal reflection | 12 |

541 | If parabolic profile is used for refractive index in the core, what is the name given to such core? A. single mode core B. multi mode core c. differential mode core D. curvilinear differential core | 12 |

542 | 44. Consider an equiconvex lens of radius of curvature R and focal length f. Iff>R, the refractive index ju of the material of the lens (a) is greater than zero but less than 1.5 (b) is greater than 1.5 but less than 2.0 (c) is greater than 1.0 but less than 1.5 (d) none of these 11 | 12 |

543 | What will be the radius of curvature of a concave mirror whose focal length is 25 ( mathrm{cm} ? ) | 12 |

544 | Three right angled prisms of refractive indices ( mu_{1}, mu_{2} ) and ( mu_{3} ) are joined together ao that the faces of the middle prism are each in contact with one of the outside prisms. If the ray passes through the composite block undeviated, then A ( cdot 1+mu_{2}^{2}=mu_{1}^{2}+mu_{3}^{2} ) B ( cdot mu_{1}^{2}-mu_{3}^{2}+mu_{2}^{3}=1 ) C. ( mu_{1}^{2}-mu_{3}^{2}-mu_{2}^{3}=1 ) D ( cdot mu_{2}^{2}+mu_{3}^{3}-mu_{2}^{1}=1 ) | 12 |

545 | A ray of light is incident on a glass slab making an angle of ( 60^{0} ) with the surface. Calculate the angle of refraction in glass and the velocity of light in glass if the refractive index of glass and the velocity of light in air are 1.5 and ( 3.0 times 10^{8} mathrm{m} / mathrm{s} ) respectively. A ( cdot 28^{circ} 30^{prime}, 3 times 10^{8} mathrm{ms}^{-1} ) B . ( 40^{circ} 20^{prime}, 2.5 times 10^{8} mathrm{ms}^{-1} ) C. ( 35^{circ} 15^{prime}, 2 times 10^{8} mathrm{ms}^{-1} ) D. ( 28^{circ} 30^{prime}, 2.5 times 10^{8} mathrm{ms}^{-1} ) | 12 |

546 | 34. Refraction takes place at a convex spherical boundary separating glass-air medium. For the image to be real, the object distance (u= 3/2) should be/is (a) greater than three times the radius of curvature of the refracting surface (b) greater than two times the radius of curvature of the refracting surface (c) greater than the radius of curvature of the refracting surface (d) independent of the radius of curvature of the refracting surface | 12 |

547 | In an equilateral glass prism, for two angles of incidence, differing by ( 10^{circ}, ) the angle of deviation is found to be ( 40^{circ} ) find these angles of incidence. | 12 |

548 | In the figure shown, A ray of light is falling at the angle of incidence ( boldsymbol{theta} ) Identify which of the following best describe the angle of reflection? ( A ) B. 2 ( c cdot 3 ) D. 4 ( E cdot 5 ) | 12 |

549 | A ray of light ( O P ) passes through a right angled prism as shown in the adjacent diagram. State the angles of incidence at the faces ( A C ) and ( B C . ) Given critical angle is ( 42^{circ} ) A . Angle of incidence at the face ( A C=45^{circ} ) and angle of incidence at the face ( B C=90^{circ} ) B. Angle of incidence at the face ( A C=90^{circ} ) and angle of incidence at the face ( B C=45^{circ} ) C. Angle of incidence at the face ( A C=45^{circ} ) and angle of incidence at the face ( B C=0^{circ} ) D. Angle of incidence at the face ( A C=0^{circ} ) and angle of incidence at the face ( B C=45^{circ} ) | 12 |

550 | Fill in the blanks: A convex lens of ( _{text {一一一一一一 }} ) focal length gives a greater magnification than lenses of ( _{text {一一一一一一一 }} ) focal length. A. short, short B. short, long c. long, short D. Iong, long | 12 |

551 | A person having eye problems should eat: A. spinach, carrot B. egg, milk c. rice, banana D. meat, apple | 12 |

552 | Find the co-ordinates of image of point object P formed after two successive reflection at concave mirror and then at convex | 12 |

553 | In case of a virtual and erect image, the magnification of a mirror is : A. Positive B. Negative c. Unity D. Infinity | 12 |

554 | In a glass sphere, there is a small bubble ( 22 times 10^{-2} mathrm{m} ) from its centre. If the bubble is viewed along a diameter of the sphere, from the side on which it lies. The distance from the surface where it appears is (The radius of glass sphere is ( 25 times 10^{-2} ) ( mathrm{m} ) and refractive index of glass is 1.5 A . 22.5 ( times 10^{-2} mathrm{m} ) B. 23.2 ( times 10^{-2} mathrm{m} ) ( c cdot 26.5 times 10^{-2} mathrm{m} ) D. 20.2 ( times 10^{-2} mathrm{m} ) | 12 |

555 | During dispersion of light, the least dispersed light is : A . violet B. green c. yellow D. red | 12 |

556 | When the length of a microscope tube increases, its magnifying power: A. decreases B. increases c. does not change D. can’t say | 12 |

557 | Why we are not able to see our image on a cardboard even though it reflects light? A. Because cardboard does not shine like mirror B. Because cardboard is not as durable as mirror c. Because cardboard’s surface is irregular D. All | 12 |

558 | A boy of height ( 1.5 mathrm{m} ) with his eye level at ( 1.4 mathrm{m} ) stands before a plane mirror of length ( 0.75 mathrm{m} ) fixed on the wall. The height of the lower edge of the mirror above the floor is ( 0.8 mathrm{m} ). Then : A. the boy will see his full image B. the boy can’t see his hair c. the boy can’t see his feet D. the boy can see neither his hair nor his feet | 12 |

559 | A ray of light passes through a prism as shown in the figure. The angle ( delta ) is known as: A. Angle of deviation B. Angle of dispersion c. Angle of emergence D. Angle of refraction | 12 |

560 | Read the statements and mark the correct one(s) i. Braille cells are read from left to right. ii Each Braille character is made up of six dots. iii Braille can only be produced manually. A. i and i i B. ii and iii c. i and iii D. All are true | 12 |

561 | A microscope: A. converges light B. diverges light C . reflects light D. refracts light | 12 |

562 | Which of the following statements is true? A. Normal is always perpendicular to the mirror B. Incident ray is always on the left side of the normal c. Both A and B D. None | 12 |

563 | A double convex lens, made of a material of refractive index ( mu_{1}, ) is placed inside two liquids of refractive indices ( mu_{2} ) and ( mu_{3} ) as shown. ( mu_{2}>mu_{1}>mu_{3} ) A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to A. a single convergent beam B. two different convergent beams c. two different divergent beams D. a convergent and a divergent beam | 12 |

564 | Three lenses of power ( +1.5 D ) and ( -0.5 D ) are kept in contact on their principal axis. What is the effective power of the combination? | 12 |

565 | The sun appears red at the time of sun- rise and sun-set. This is because: A. red colour is least scattered B. red colour is most scattered c. the sun is red in colour D. our eyes can sense only red colou | 12 |

566 | Q Type your question z. Here z is the vertical distance inside the slab, measured from the top. The slab is placed between two media with uniform refractive indices ( n_{1} ) and ( n_{2} ) ( left(>n_{1}right), ) as shown in the figure. A ray of light incident with angle ( boldsymbol{theta}_{boldsymbol{i}} ) from medium 1 and emerges in medium 2 with refraction angle ( theta_{f} ) with lateral displacement ( l ) Which of the following statement(s) is (are) true? This question has multiple correct options A. ( l ) is dependent on ( n(z) ) B ( cdot n_{1} sin theta_{1}=left(n_{2}-n_{1}right) sin theta_{f} ) ( mathbf{c} cdot n_{1} sin theta_{i}=n_{2} sin theta_{f} ) dependent of ( n ) | 12 |

567 | In a Newton’s Ring experiment, the diameter of the ( 20^{t h} ) dark ring was found to be 5.82 mm and that the ( 10 t h ) ring 3.36 mm. If the radius of the planoconvex lens is ( 1 m, ) calculate the wavelength of light used | 12 |

568 | What is the angle between the incident and reflected rays when a ray of light is incident normally on a plane mirror? A ( cdot 90^{circ} ) B . ( 45^{circ} ) ( c cdot 180^{circ} ) D. ( 0^{circ} ) | 12 |

569 | A light is incident normally on a mirror. The value of angle of reflection will be ( mathbf{A} cdot 90 ) B . 45 ( c cdot 0^{c} ) D. 135 | 12 |

570 | Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the: A. Lens slightly towards the screen B. Lens slightly away from the screen c. Lens slightly towards the sun D. Lens and screen both towards the sun | 12 |

571 | At what distance should an object be placed from a convex lens of focal length ( 18 mathrm{cm} ) to obtain an image at ( 24 c m ) if on the other side. What will be the magnification produced in this case? | 12 |

572 | When a ray of light strikes a plane mirror at an angle of ( 15^{circ} ) with the mirror, what will be the angle of reflection with respect to the normal? A . 15 B. 30 ( c cdot 75 ) D. None of these | 12 |

573 | The bluish colour of water in deep sea is due to: A. the presence of algae and other plants found in water. B. reflection of sky in water c. scattering of light. D. absorption of light by the sea | 12 |

574 | Which instrument is used to view astronomical bodies. | 12 |

575 | An object is placed at a distance ( 2 f ) from the pole of a convex mirror of focal length ( f . ) The linear magnification is: A ( cdot frac{1}{3} ) B. ( frac{2}{3} ) ( c cdot frac{3}{4} ) D. | 12 |

576 | A light ray is incident normally on a plane mirror. (a) What is the angle of incidence? (b) What is the path of reflected ray? A ( cdot(a) 180^{circ},(b) ) same as incident ray в. ( (a) 180^{circ} ) ( (b) ) opposite to incident ray (b) opposite to incident ray ( mathbf{c} cdot(a) 0^{circ} ) D. ( (a) 0^{circ},(b) ) same as incident ray | 12 |

577 | A car is fitted with a convex side-view mirror of focal length ( 20 mathrm{cm} . ) A second car ( 2.8 mathrm{m} ) behind the first car is overtaking the first car at a relative speed of ( 15 mathrm{m} / mathrm{s} ). The speed of the image of the second car as seen in the mirror of the first one is : A ( cdot frac{1}{10} mathrm{m} / mathrm{s} ) в. ( frac{1}{15} mathrm{m} / mathrm{s} ) c. ( 10 mathrm{m} / mathrm{s} ) D. ( 15 mathrm{m} / mathrm{s} ) | 12 |

578 | Derive the Lens Maker’s formula. | 12 |

579 | Assertion The frequencies of incident, reflected and refracted beam of monochromatic light at the interface of two media are same Reason The incident, reflected, refracted rays are coplanar. A. If both assertion and reason are true and reason is the correct explanation of assertion B. If both assertion and reason are true and reason is not the correct explanation of assertion c. If assertion is true but reason is false D. If both assertion and reason are false | 12 |

580 | A rod of length ( 10 mathrm{cm} ) lies along the principal axis of a concave mirror of focal length ( 10 mathrm{cm} ) in such away that the end closer to the pole is ( 20 mathrm{cm} ) away from it. Find the length of the image. A . ( 2 mathrm{cm} ) B. ( 4 mathrm{cm} ) ( c cdot 5 mathrm{cm} ) D. ( 6 mathrm{cm} ) | 12 |

581 | Assertion The right-handed coordinate system is converted into left-handed coordinate system by a plane mirror and Reason Plane mirror produces the reversal in the direction of normal A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason are correct | 12 |

582 | The light ray which strikes any polished surface at some angle is called: A . reflected ray B. incident ray c. normal ray D. none of these | 12 |

583 | A Nicol prism is based on the principle of. A. Refraction B. Scattering c. Dichroism D. Double refraction | 12 |

584 | A converging beam of light travelling in air converges at a point ( P ) as shown in the figure. When a glass sphere of refractive index 1.5 is introduced in between the path of the beam, calculate the position of the image. Also draw the ray diagram for the image formed | 12 |

585 | Why do stars twinkle? | 12 |

586 | Match List-I with List- II and select the answer using the codes given below the lists: begin{tabular}{lll|l} List-I & multicolumn{3}{l} { List-II } \ A. & Microscope & 1. & To see objects on the surface by an observer in a trench \ B. & Telescope & 2. & To see small objects \ C. & Periscope & 3. & To see distant objects \ D. & Camera & 4. & To take photographs of objects end{tabular} ( A ) ( begin{array}{llll}2 & 1 & 4 & 3end{array} ) B. ( 1 quad 2 quad 3 quad 4 ) ( begin{array}{llll}mathbf{c} cdot 2 & 3 & 4 & 1end{array} ) ( begin{array}{ll}text { D. } 2 & text { (年) } 3end{array} ) | 12 |

587 | (i) Why does the Sun appear red at sunrise? (iii) Name the subjective property of light related to its wavelength. | 12 |

588 | What are the characteristics of the final image formed by a compound microscope? | 12 |

589 | Very fine particles mainly scatter coloured light. A . Red B. Blue c. Green D. Yellow | 12 |

590 | A ( 4 mathrm{cm} ) tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is ( 12 mathrm{cm} ) and its sharp image is formed at a distance of ( 24 mathrm{cm} ) from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected? | 12 |

591 | Match the elements of table I and II. begin{tabular}{ll} Table I & table II \ a) Myopia & i) Bifocal len \ b) Hypermetropia & ii) Cylindrical lens \ c) Presbyopia & iii) Concave lens \ d) Astigmation & iv) Convex lens \ hline end{tabular} ( A cdot a- ) iii, b – iv, c-i, d -ii B. a – iv, b – iii, c-i, d- i i ( c cdot a-i, b-i i, c-i i i, d-i v ) D. a – ii, b – iv, c-i, d- iii | 12 |

592 | When the light enters from air to glass, which colour the angle of deviation maximum? A. Red B. Yellow c. Blue D. Violet | 12 |

593 | A square of side ( 3 mathrm{cm} ) is located at a distance ( 25 mathrm{cm} ) from a concave mirror of focal length ( 10 mathrm{cm} ). The center of square is at the axis of the mirror and the plane is normal to axis of mirror. The area enclosed by the image of the square is : A ( cdot 4 c m^{2} ) в. ( 6 mathrm{cm}^{2} ) c. ( 16 mathrm{cm}^{2} ) D. ( 36 c m^{2} ) | 12 |

594 | Select the odd one out w.r.t. the type of reflection of incident light (wood, steel, silver, mirror, graphite) A. mirror B. woodd c. silver D. steel | 12 |

595 | The minimum distance between an object and its real image formed by a convex lens is : A ( cdot frac{2}{3} f ) B . ( 2 f ) c. ( frac{5}{2} f ) D. ( 4 f ) | 12 |

596 | Two identical glass ( left(mu_{g}=3 / 2right) ) equiconvex lenses of focal length ( f ) are kept in contact. The space between the two lenses is filled with water ( left(mu_{w}=right. ) 4/3). The focal length of the combination is ( A cdot f ) в. ( frac{f}{2} ) c. ( frac{4 f}{3} ) D. ( frac{3 f}{4} ) | 12 |

597 | An old man cannot see objects closer than ( 1 mathrm{m} ) from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagram for the (i) defect of vision and also (ii) for its correction. | 12 |

598 | A persons sees clearly at a distance of 100cm, then power of lens used to see object at ( 40 mathrm{cm} ) is ( A .3 D ) в. ( -3 D ) c. ( -1.5 D ) D. ( +1.5 D ) | 12 |

599 | An object of size ( 7 mathrm{cm} ) is placed at ( 27 mathrm{cm} ) in front of a concave mirror of focal length ( 18 mathrm{cm} . ) At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained ? Find the size and the nature of the image. | 12 |

600 | If you raise your right hand in front of a plane mirror, what will you see in it? A. You have raised your right hand B. You have raised your left hand c. You have lowered your right hand D. You have lowered your left hand | 12 |

601 | Rainbow is not caused due to: A. Reflection of light B. Refraction of light C. Dispersion D. Scattering | 12 |

602 | Which of the following quantity does not have any unit? A. Velocity of light B. Light year c. Magnification D. Power of a lens | 12 |

603 | A ray of light passing through a prism having ( mu=sqrt{2} ) suffer minimum deviation. It is found that angle of incidence is double the angle of refraction within the prism. Find angle of the prism. | 12 |

604 | An object is held ( 20 c m ) away from a converging lens of focal length ( 10 mathrm{cm} ) Find the position of the image formed. | 12 |

605 | A coin kept in a container and not visible can be viewed by pouring water into the container. It happens because of the A. Reflection of light. B. Refraction of light c. variable refractive index of water. D. None of the above | 12 |

606 | Draw a schematic diagram of a reflecting telescope (Cassegrain) Write its two advantages over a refracting telescope. | 12 |

607 | Two symmetrical double convex lenses A and B have same focal length,but the radii of curvature differ so that ( boldsymbol{R}= ) ( 0.9 R . ) If ( mu=1.63 ) find the ( mu_{B} ) | 12 |

608 | The equiconvex lens has focal length ( boldsymbol{f} ) If it is cut perpendicular to the principal axis passing through optical centre, then focal length of each half is A ( cdot frac{f}{2} ) B. ( f ) ( c cdot frac{3 f}{2} ) D. ( 2 f ) | 12 |

609 | A convex lens of focal length ( f ) is cut into two halves as shown. Light rays parallel to the principal axis are incident on one half of the lens ( left(operatorname{say} L_{1}right) . ) This will form an image at : ( A cdot f ) B. ( f / 2 ) ( c cdot 2 f ) D. ( f / ) | 12 |

610 | The distance at which an object should be placed in front of a convex lens of focal length ( 10 mathrm{cm} ) to obtain a real image double the size of object will be: ( A .30 mathrm{cm} ) B. ( 15 mathrm{cm} ) ( c cdot 5 mathrm{cm} ) D. ( 10 mathrm{cm} ) | 12 |

611 | The electromagnetic waves A. travel with the the speed of sound. B. travel with the the same speed in all media. C . travel in free space with the speed of light. D. do not travel through a medium. | 12 |

612 | The curved surface of a shining spoon could be considered as a A. Curved mirror B. Plane mirror c. concave mirror only D. None | 12 |

613 | A ray of light enters from air to a medium ( X . ) The speed of light in the medium is ( 1.5 times 10^{8} m / s ) and the speed of light in air is ( 3 times 10^{8} m / s ). Find the Refractive index of the medium ( boldsymbol{X} ) | 12 |

614 | The focal length of a concave mirror is ( 50 mathrm{cm} ) where an object is to be placed so that its image is two times magnified, real and inverted: A. ( 75 mathrm{cm} ) B. 72 cm ( c cdot 63 mathrm{cm} ) D. 50 cm | 12 |

615 | Rays of light from Sun falls on a biconvex lens of focal length ( f ) and the circular image of Sun of radius ( r ) is formed on the focal plane of the lens. Then A. Area of image is ( pi r^{2} ) and area is directly proportional of ( f ) B. Area of image is ( pi r^{2} ) and area is directly proportional to ( t^{2} ) c. Intensity of image increases if ( f ) is increased D. If lower half of the lens is covered with black paper, area will become half | 12 |

616 | What is the angle of incidence when the incident ray is normal to the interface or boundary separating two media? A ( cdot 0^{circ} ) B. ( 90^{circ} ) ( c cdot 180^{circ} ) D. ( 45^{circ} ) | 12 |

617 | Which of the following is a correct way by which we can take care of our eyes? A. Reading the books by bringing as near as possible B. Washing our eyes frequently C. Using as much light as possible while studying D. Looking directly at sun every morning | 12 |

618 | In which direction does he move the lens to focus the flame on the screen? | 12 |

619 | A ray of light passes through an equilateral prism (refractive index 1.5 ) such that angle of incidence is equal to angle of emergence and the latter is equal to ( 3 / 4^{t h} ) of the angle of prism. The angle of deviation is A .60 B. ( 30^{circ} ) c. 45 D. ( 120^{circ} ) | 12 |

620 | A number of thin prism of prism angle ( A ) and refractive index ( mu ) are arranged on periphery of circle such that any light ray entering from one prism move along a regular polygon A. number of prism used will be ( frac{4 pi}{(mu-1) A} ) B. If ( A ) is rational, ( mu ) must be rational c. if ( A ) is rational, ( mu ) must be irrational D. If ( A ) is irrational, ( mu ) must be irrational | 12 |

621 | A perfectly reflecting solid sphere of radius ( r ) is kept in the path of a parallel beam of light of large aperture. If the beam carries an intensity I, find the force exerted by the beam on the sphere. | 12 |

622 | Which of the following is Shell’s law A. ( n_{1} ) sini ( =n_{2} ) sinr В ( cdot n_{1} / n_{2}=sin r times ) constant c. ( n_{2} / n_{1}=sin r / sin i ) D. ( n_{2} sin i= ) constant | 12 |

623 | What type of mirrors do we use in our houses to see ourselves? A. Convex mirror B. Plane mirror c. Concave mirror D. Any of the above | 12 |

624 | The image of an object formed by a convex lens when the object is placed between the lens and the focal point is – A. Virtual and inverted B. Real and magnified c. Real and diminished D. Virtual and magnified | 12 |

625 | Periscope works on the principle of: A. refraction of light B. reflection of light c. diffraction of light D. scattering of light | 12 |

626 | Colours of rainbow are in VIBGYOR sequence: A . True B. False | 12 |

627 | A container contains water up to a height of ( 20 mathrm{cm} ) and there is a point source at the centre of the bottom of the container. A rubber ring of radius ( r ) floats centrally on the water. The ceiling of the room is ( 2.0 m ) above the water surface. (a) Find the radius of the shadow of the ring formed on the ceiling if ( r=15 mathrm{cm} ) (b) Find the maximum value ( r ) for which the shadow of the ring is formed on the ceiling. Refrective index of water ( =mathbf{4} / mathbf{3} ) | 12 |

628 | Bi-focal lens is required to correct: A. cataract B. astigmatism c. myopia D. presbyopia | 12 |

629 | Four identical mirrors are made to stand vertically to form a square arrangement as shown in a top view. A ray starts from the midpoint M of mirror Ad and after two reflections reaches cornor D. Then, angle ( theta ) must be A ( cdot tan ^{-1}(0.75) ) B ( cdot cot ^{-1}(0.75) ) c. ( sin ^{-1}(0.75) ) D cdot ( cos ^{-1}(0.75) ) | 12 |

630 | What do you mean by “Rectilinear Propagation” of Light? A. Light travels in a straight line B. Light travels in a curved path C. Light exhibits dual nature of particle and wave D. Light gets deviated when it moves in another medium | 12 |

631 | A biconvex lens of focal length ( 15 mathrm{cm} ) is in front of a plane mirror. The distance between the lens and the mirror is 10 ( mathrm{cm} . mathrm{A} ) small object is kept at a distance of ( 30 mathrm{cm} ) from the lens. The final image is A. Virtual and at a distance of ( 16 mathrm{cm} ) from the mirror B. Real and at a distance of ( 16 mathrm{cm} ) from the mirror c. Virtual and at a distance of ( 20 mathrm{cm} ) from the mirror D. Real and at a distance of ( 20 mathrm{cm} ) from the mirro | 12 |

632 | How does the power of lens vary with its focal length? | 12 |

633 | A reflecting surface is represented by the equation ( Y=frac{2 L}{pi} sin left(frac{pi x}{L}right), 0 leq ) ( x leq L . ) A ray travelling horizontally becomes vertical after reflection. The coordinates of the point(s) where this ray is incident is A . True B. False | 12 |

634 | VUJ 7. The aperture of the objective lens of a telescope is made large so as to (a) increase the magnifying power of the telescope (b) increase the resolving power of the telescope (c) make image aberration less (d) focus on distant objects (AIEEE 2003) | 12 |

635 | The nature of image of a candle flame located ( 40 mathrm{cm} ) from a concave spherical mirror is real, inverted and magnified four times. Then the radius of curvature of the mirror is: ( A .32 mathrm{cm} ) B. ( 64 mathrm{cm} ) c. ( 48 mathrm{cm} ) D. ( 80 mathrm{cm} ) | 12 |

636 | Iris : controls the size of the pupil :: : regulates the amount of light entering the eye A. Pupil B. Lens c. Retina D. cornea | 12 |

637 | An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distances are measured by: A. a screw gauge provided on the microscope B. a standard laboratory scale c. a vernier scale provided on the microscope D. a meter scale provided on the microscope | 12 |

638 | A clock fixed on a wall shows time 04: ( 25: 37 . ) Its image in a plane mirror shows: ( A cdot 07: 30: 33 ) B. 07:43: 32 c. 07: 35: 22 D. 43: 27: 36 | 12 |

639 | Refractive indices of 2 different media with separating boundary at the diagonal of rectangular glass slab are shown. Total angle of deviation of the ray as shown in the figure, when it emerges in air is : air A ( cdot 120^{circ} ) B. 90 ( c cdot 60^{circ} ) D ( .45^{circ} ) ( E cdot 30 ) | 12 |

640 | For the same angle of incidence, the angles of refraction in media ( mathrm{P}, mathrm{Q}, mathrm{R} ) and ( mathrm{S} ) are ( 50^{circ}, 40^{circ}, 30^{circ}, 20^{circ}, ) respectively. The speed of light is minimum in medium: ( A cdot P ) B. ( c cdot R ) ( D cdot s ) | 12 |

641 | A ray of light is incident at an angle ( i ) on a glass slab of refractive index ( mu ). The angle between reflected and refracted light is ( 90^{circ} . ) Then, the relationship between i and ( mu ) is : A ( cdot i=tan ^{-1}left(frac{1}{mu}right) ) В. ( tan i=mu ) ( mathrm{c} cdot sin i=mu ) D. ( cos i=mu ) | 12 |

642 | The rays of light, which are not paralle to each other and spread out from a point, are called and a bundle of rays, which are parallel to one another, is called A. parallel beam of light, convergent rays B. divergent rays, convergent rays c. convergent rays, parallel beam of light D. divergent rays, parallel beam of light | 12 |

643 | Doctor has prescribed a lens having power ( +1.5 D . ) What would be the focal length of the lens? What is the type of lens and what must be the defeat of vision? | 12 |

644 | Define the magnifying power of a compound microscope when the final image is formed at infinity. Why must both the objective and the eyepiece of a compound microscope have short focal lengths? Explain. | 12 |

645 | A convex lens forms a real image three times larger than the object on a screen Object and screen are moved until the image becomes twice the size of the object. If the shift of the object is ( 6 mathrm{cm} ) The shift of screen is ( mathbf{A} cdot 36 c m ) B. ( 72 mathrm{cm} ) ( mathbf{c} cdot 18 c m ) D. 9 cm | 12 |

646 | A light ray is incident perpendicular to one face of a ( 90^{0} ) prism and is totally intemally reflected at the glass-air interface. If the angle of reflection is ( 45^{circ} ) we conclude that the refractive index n 4 B ( . n>sqrt{2} ) ( c cdot n>frac{1}{sqrt{2}} ) D. ( n<sqrt{2} ) | 12 |

647 | A thin lens of focal length ( 10 mathrm{cm} ) is cut into two equal halves and are kept as shown in figure. It an object ( boldsymbol{O} ) is placed at distance ( 10 mathrm{cm} ) from the optical centre of combination. then the distance of image from object will be ( A cdot 5 mathrm{cm} ) B. 7.5 ( mathrm{cm} ) ( c cdot 10 mathrm{cm} ) D. 20 cm | 12 |

648 | “The magnification produced by a spherical mirror is – ( 3 ” ). List four informations you obtain from this statement about the mirror/image. | 12 |

649 | In what cases, does a light ray not deviate at the interface of two media? | 12 |

650 | 51. A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices , and Hy and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination is (a) (b) 2R – H2 10 R M₂ – Mi R 2-(M + M₂ 24 – M₂) | 12 |

651 | The magnification of a magnifying lens of focal length ( 5 mathrm{cm} ) is : (final image is at ( infty) ) ( A ) B. 2 ( c cdot 3 ) D. 5 | 12 |

652 | A denser medium of refractive index 1.5 has a concave surface of radius of curvature ( 12 mathrm{cm} . ) An object is situated in the denser medium at a distance of 9 ( mathrm{cm} ) from the pole. Locate the image due to refraction in air A. A real image at ( 8 mathrm{cm} ) B. A virtual image at ( 8 mathrm{cm} ) c. A real image at ( 4.8 mathrm{cm} ) D. A virtual image at ( 4.8 mathrm{cm} ) | 12 |

653 | The angle between the two refracting surface of a prism is called angle of : A. incidence B. base c. dispersion D. prism | 12 |

654 | Which of the following is a natural source of light? A. Electric lamp B. Electric filament c. Torch light D. Sunlight | 12 |

655 | The inability among the elderly to see nearby objects clearly because of the weaking of the ciliary muscles is called A. far-sightedness B. near-sightedness c. presbyopia D. astigmatism | 12 |

656 | A thin equiconvex lens of refractive index ( 3 / 2 ) is placed on a horizontal plane mirror as shown in figure. The space between the lens and the mirror is filled with a liquid of refractive index 4/3. It is found what when a point object is placed ( 15 mathrm{cm} ) above the lens on its principal axis, the object coincides with its own image. If another liquid is filled instead of water, the object and the image coincide at a distance ( 25 mathrm{cm} ) from the lens. Calculate the refractive index of the liquid. ( mathbf{A} cdot 1.6 ) в. 2.6 ( c .2 .8 ) D. 3.2 | 12 |

657 | The relation between ( u, v ) and ( f ) for a mirror is given by A ( cdot f=frac{u times v}{u-v} ) в. ( f=frac{2 u times v}{u+v} ) c. ( _{f}=frac{u times v}{u+v} ) D. ( f=frac{u-v}{u+v} ) | 12 |

658 | A glass hemisphere of radius ( R ) and of material having refractive index 1.5 is silvered on its flat face as shown in figure. A small object of height ( h ) is located at a distance ( 2 R ) from the surface of hemisphere as shown in figure. The final image will form. A. At a distance of ( R ) from silvered surface, on the right side B. On the object itself C. At hemisphere surface D. At a distance of ( 2 R ) from the silvered surface, on left side | 12 |

659 | In a healthy human eye, the focussing is done by the A. To and fro movement of the eye-lens B. Changing the curvature of the retina C. Change in the convexity of the lens through ciliary tubes D. Change in the refractive index of the eye fluid | 12 |

660 | Two plane mirrors are placed parallel to each other at a distance Lapart. A point object 0 placed between them, at a distance L/3 from one mirror. Both mirrors form multiple images. The distance between any two images cannot be A ( cdot frac{3 L}{2} ) в. ( frac{2 L}{3} ) ( c cdot 2 L ) D. ( L ) | 12 |

661 | A gun of mass ( m_{1} ) fires a bullet of mass ( m_{2} ) with a horizontal speed ( v_{0} . ) The gun is fitted with a concave mirror of focal length ( f ) facing toward a receding bullet. Find the speed of separations of the bullet and the image just after the gun was fired. | 12 |

662 | Which is smaller?2497 or 2597 | 12 |

663 | The angle between an incident ray and the mirror is ( 60^{circ} . ) Then the total angle turned by the ray of light is: A ( .60^{circ} ) B . ( 120^{circ} ) ( c cdot 30^{circ} ) D. ( 90^{circ} ) | 12 |

664 | In the figure shown the radius of curvature of the left ( & ) right surface of the concave lens is ( 10 mathrm{cm} & 15 mathrm{cm} ) respectively. The radius of curvature of the mirror is ( 15 mathrm{cm} ) A. Equivalent focal length of the combination is ( 18 mathrm{cm} ) B. Equivalent focal length of the combination is ( +36 mathrm{cm} ) c. The system behaves like a concave mirror D. The system behaves like a convex mirror | 12 |

665 | Describe the construction of a compound microscope. Derive an expression for its total magnification. Draw a ray diagram for the formation of image by a compound microscope. | 12 |

666 | A light moves from denser to rarer medium, which of the following is correct? A. Energy increases B. Frequency increases C. Phase changes by ( 90^{circ} ) D. Velocity increases | 12 |

667 | Which of the following phenomenon is involved in Tyndall effect? A. Reflection of light. B. Refraction of light c. scattering of light. D. Magnification of light. | 12 |

668 | A drop of water is placed on a glass plate. A double convex lens having radius of curvature of each surface 20 ( mathrm{cm} ) is placed on it. The focal length of water lens ( left(mu text { for water }=frac{3}{4}right), ) will be A . -0.20 B. -0.60 ( mathrm{m} ) ( c .0 .30 ) D. ( 0.40 mathrm{m} ) | 12 |

669 | In the diagram shown, a light ray is incident on the lower medium boundary at an angle if ( 45^{circ} ) with the normal. Which of the following statements is are true? ‘his question has multiple correct options A ( cdot ) If ( mu_{2} / sqrt{2} ), then angle of deviation is 45 B. If ( mu_{2} / sqrt{2} ), then angle of deviation is ( 90^{circ} ) ( mathrm{C} cdot ) If ( mu_{2} / sqrt{2}, ) then angle of deviation is ( 135^{circ} ) D. If ( mu_{2} / sqrt{2} ), then angle of deviation is 0 | 12 |

670 | Assertion: By roughening the surface of a glass sheet its transparency can be reduced. Reason: Glass sheet with rough surface absorbs more light. | 12 |

671 | What is known as linear magnification of spherical mirrors? A. Ratio of size of image to size of object B. Ratio of shape of image to size of object c. Ratio of size of image to shape of object D. None | 12 |

672 | Magnification produced by a concave lens is always: A. less than 1 B. more than 1 c. equal to 1 D. equal to 2 | 12 |

673 | 60. A convex lens forms an image of an object placed 20 cm away from it at a distance of 20 cm on the other side of the lens. If the object is moves 5 cm toward the lens, the image will be (a) 5 cm toward the lens (b) 5 cm away from the lens (c) 10 cm toward the lens (d) 10 cm away from the lens | 12 |

674 | Sunlight of intensity ( 1.3 k W m^{-2} ) is incident normally on a thin convex lens of focal length ( 20 mathrm{cm} ). Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light, in ( k W m^{-2}, ) at a distance ( 22 c m ) from the lens on the other side is | 12 |

675 | A nearsighted person cannot be see beyond ( 25 mathrm{cm} . ) Assuming that the separation of the glass from the eye is ( mathbf{1} c m, ) find the power of lens needed to see distant objects. | 12 |

676 | When light travels from one medium into another it suffers A. Reflection B. Refraction c. Dispersion D. None of these | 12 |

677 | Where must an object be placed in front of a convex lens so that the image formed is at infinity? | 12 |

678 | Light is a form of energy. A. True B. False | 12 |

679 | Name the type of lens used to correct this defect. | 12 |

680 | Mark correct option or options: A. The minimum distance between a real image and the real object in concave mirror is zero B. The minimum distance between a real object and real image in concave mirror is greater than ( 4 f ), where ( f ) is focal length of the lens C. The focal length of concave mirror depends upon the wavelength of light incident on it D. The focal length of mirror depends upon medium infront of the mirror | 12 |

681 | The unit of magnification is : ( mathbf{A} cdot m ) B. ( m^{2} ) ( mathrm{c} cdot m^{-1} ) D. it has no units | 12 |

682 | Concave and convex lenses, each have the same focal length ( 20 mathrm{cm} ) and they are put in contact to form a combination lens. This combination lens is used to view an object of ( 5 mathrm{cm} ) length, kept at a distance ( 20 mathrm{cm} ) from the lens combination. As compared to the object the image will be A. Magnified and inverted. B. Reduced and erect. C. of the same size as the object and erect. D. of the same size as the object but inverted. | 12 |

683 | A concave mirror produces 10 times enlarged image (real) of an object placed ( 1 c m ) in front of it. Where is the image located? A ( .5 mathrm{cm} ) B. ( -10 mathrm{cm} ) c. ( -5 c m ) D. ( 10 mathrm{cm} ) | 12 |

684 | A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point ( 15 mathrm{cm} ) from the lens. If the lens is removed, the point where the rays meet will move ( 5 mathrm{cm} ) closer to the mounting that holds. Find the focal length ( (text { in } mathrm{cm}) ) of the lens without sign. | 12 |

685 | Complete the refracted ray in the flowing ray diagram | 12 |

686 | The sideways reversal of the image by plane mirror is called: A. lateral inversion B. parallax c. optical illusion D. magic | 12 |

687 | A concave lens of focal length ( boldsymbol{f} ) produces an image ( (1 / n) ) times the size of the object. The distance of the object from the lens is A ( cdot(n+1) f ) в. ( frac{(n-1)}{n} f ) c. ( frac{(n+1)}{n} f ) D. ( (n-1) f ) | 12 |

688 | The angle between the normal and the reflected ray is ( 40^{circ} . ) Then the angle of incidence will be A ( .50^{circ} ) B. ( 20^{circ} ) ( c cdot 40^{circ} ) D. Can’t be predicted | 12 |

689 | Fruits and vegetables advisable for good vision are: A. apple, banana, carrots B. mango, papaya, carrots c. cabbage, sunflower oil, groundnut D. all fruits and vegetables | 12 |

690 | Fill in the blanks. a) For a motor: a permanent magnet, then for a commercial motor: b) Focal length of a lens: metre, then for power of a lens: | 12 |

691 | The reflecting surface of a plane mirror is vertical. A particle is a project in a vertical plane also perpendicular to the mirror the initial speed of the particle is ( 10 mathrm{m} / mathrm{s} ) and the angle of project ( 60^{circ} ) from the normal of the mirror. the point of projection is at a distance ( 5 mathrm{m} ) from particle moves towards the mirror.just before the particle touches the mirror. the velocity of approving of the particle and the image is: A. ( 12 mathrm{m} / mathrm{s} ) B. ( 5 mathrm{m} / mathrm{s} ) c. ( 10 mathrm{m} / mathrm{s} ) D. ( 5 sqrt{5} ) m/s | 12 |

692 | Sun ray are incident at an angle of ( 24^{circ} ) with the horizontal. How can they be directed parallel to the horizon using a plane mirror? | 12 |

693 | (a) Write the necessary conditions for the phenomenon of total internal reflection to occur. (b) Write the relation between the refractive index and critical angle for a given pair of optical media. | 12 |

694 | In passing through a boundary, refraction will not take place if This question has multiple correct options A. light is incident normally on the boundary B. the indices of refraction of the two media are same c. the boundary is not visible D. angle of incidence exceeds the critical angle | 12 |

695 | Pick the incorrect statement from the following: A. Iris is the part of the eye which gives it, its distinctive colour B. The most comfortable distance at which one can read with a normal eye is about ( 50 mathrm{cm} ) C. If still images of a moving object are flashed on the eye at a rate faster than ( 16 / s ), then, the eye perceives this object as moving D. Eye lens becoming cloudy is called cataract | 12 |

696 | A point object is placed at a distance of ( 25 mathrm{cm} ) from a convex lens of focal length ( 20 mathrm{cm} . ) If a glass slab of thickness ( t ) and refractive index 1.5 is inserted between the lens and the object, the image is formed at infinity. The thickness ( t ) is ( mathbf{A} cdot 10 mathrm{cm} ) в. ( 5 mathrm{cm} ) ( mathbf{c} cdot 20 c m ) D. ( 15 mathrm{cm} ) | 12 |

697 | As the beam enters the medium, it will A . diverge B. converge c. diverge near the axis and converge near the periphery D. travel as a cylindrical beam | 12 |

698 | 39. A ray of light passes from glass, having a refractive indey of 1.6, to air. The angle of incidence for which the angle of refraction is twice the angle of incidence is (a) sin- (b) sin- | 12 |

699 | What is reflection? Write the laws of reflection. | 12 |

700 | When a pencil is partly immersed in water, the pencil appears to bend at the surface. Reason behind this is: A . Reflection B. Refraction c. Total internal reflection D. Diffraction | 12 |

701 | A light ray is incident on a transparent sphere of index ( =sqrt{2}, ) at an angle of incidence ( =45 . ) What is the deviation of a tiny fraction of the ray, which enters the sphere, undergoes two internal reflections and then refracts out into air ( ? ) A . 270 B. 240 ( c . ) 30 D. 180 | 12 |

702 | How can we change a camera from ( boldsymbol{F} / mathbf{4} ) ( operatorname{to} F / 5.6 ? ) A. Increase the aperture to 2 time keeping the focal distance constant B. Increase the aperture to ( sqrt{2} ) time keeping the focal distance constant C . Increase the aperture to ( frac{1}{2} ) time keeping the focal distance constant D. Increase the aperture to ( frac{1}{sqrt{2}} ) time keeping the focal distance constant | 12 |

703 | Air is not visible because it: ( mathbf{A} cdot ) is nearly a perfectly transparent substance B. neither absorbs nor reflects light C. transmits whole of light D. follows all of the above | 12 |

704 | How will you design a shaving mirror assuming that a person keeps it ( 10 mathrm{cm} ) from his face and view the magnified image of the face of the closest comfortable distance of ( 25 mathrm{cm} ). The radius of curvature of the mirror would then be: ( mathbf{A} cdot 24 mathrm{cm} ) B. ( -60 c m ) ( c .-24 c m ) D. ( 30 mathrm{cm} ) | 12 |

705 | The relation between ( u, v ) (u is the object distance and v is the image distance ) and f for mirror is given by: A ( cdot f=frac{u v}{u-v} ) B. ( f=frac{2 u times v}{u+v} ) c. ( f=frac{u times v}{u+v} ) D. none of these | 12 |

706 | Assertion: There exist two angles of incidence for the same magnitude of deviation (except minimum deviation) by a prism kept in the air. Reason: In a prism kept in the air, a ray is incident on the first surface and emerges out of the second surface. Now if another ray is incident on second. surface (of the prism) along the previous emergent ray, then this ray emerges out of the first surface along the previous incident ray. This principle is called the principle of reversibility of light. A. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion B. Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 12 |

707 | The human eye forms the image of an object at its A. cornea B. iriss c. pupil D. retina | 12 |

708 | A water film is formed on a glass-block. A light ray is incident on water film from air at an angle of ( 60^{circ} ) with the normal. The angle of incidence on glass slab is ( left(mu_{g}=1.5, mu_{w}=frac{4}{3}right) ) A ( cdot sin ^{-1}left(frac{3 sqrt{3}}{8}right) ) в. ( sin ^{-1}left(frac{1}{sqrt{3}}right) ) c. ( sin ^{-1}left(frac{4 sqrt{3}}{9}right) ) D. ( sin ^{-1}left(frac{9 sqrt{3}}{16}right) ) | 12 |

709 | An object is placed ( 25 mathrm{cm} ) from a convex lens whose focal length is ( 10 mathrm{cm} ). The image distance is ( (50 c m, 16.66 c m, 6.66 c m, 10 c m) ) | 12 |

710 | State whether true or false. The line drawn perpendicular to the mirror at the point of incidence is called the reflected ray. A. True B. False | 12 |

711 | A diverging meniscus lens has a focal length of ( -20 mathrm{cm} . ) If the lens is held 10 ( mathrm{cm} ) from the object, the magnification is : A . -0.667 B. +0.667 ( c cdot-2 ) ( D cdot+2 ) | 12 |

712 | why does the sky sometimes appear white? | 12 |

713 | Why the angle of incidence must not be less then ( 30^{circ} ) while calculating angle of minimum deviation? | 12 |

714 | An object kept on the principal axis and infront of a spherical mirror, is moved along the axis itself. Its lateral magnification ( mathrm{m} ) is measured, and plotted versus object distance |ul for a range of ( u ), as shown in fig. The magnification of the object when it is placed at a distance ( 20 mathrm{cm} ) in front of the mirror is: ( A cdot- ) B. ( c ) D. 2 | 12 |

715 | Angle of reflection is the angle between reflected ray and the ……… (incident ray, normal). | 12 |

716 | Explain why the planets do not twinkle. | 12 |

717 | The diagram alongside shows the refraction of a ray of light from air to a liquid. Angle of refraction is: A ( cdot 60^{circ} ) B . ( 15^{circ} ) ( c .30^{circ} ) D. ( 45^{circ} ) | 12 |

718 | If the light moving in a straight line bends by small but fixed angle while entering in different medium, it may be a case of : A. reflection of light B. refraction of light c. scattering of light D. dispersion of light | 12 |

719 | The focal length of a convex lens of glass ( (mu=1.5) ) is ( 2 c m . ) The focal length of the lens when immersed in a liquid of refractive index 1.25 will be : A ( .5 mathrm{cm} ) B. ( 2.4 mathrm{cm} ) ( c .1 c m ) D. ( 4 c m ) | 12 |

720 | After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported his observations in tabular form as given below: ( <mathrm{e} ) s.No ( begin{array}{lccc}text { । } & 30^{0} & 19^{0} & 29^{0} \ text { ॥ } & 40^{0} & 28^{0} & 40^{0} \ text { ॥। } & 50^{0} & 36^{0} & 50^{0} \ text { । } & 60^{0} & 40^{0} & 59^{0}end{array} ) The best observation is : ( A ) B. II ( c ) D. IV | 12 |

721 | Choose the correct answer from alternatives given The mixture of a pure liquid and a | 12 |

722 | In ray diagrams, what is the least number of rays needed to find the position of an image formed by a lens? ( A cdot 4 ) B. 3 ( c cdot 2 ) D. | 12 |

723 | Choose the correct relation between ( u, v ) and ( r ) for a spherical mirror, where ( r ) is radius of curvature. A ( cdot r=frac{2 u v}{u+v} ) B. ( r=frac{2}{u+v} ) c. ( r=frac{2(u+v)}{(u v)} ) D. ( r=frac{2 u v}{u-v} ) | 12 |

724 | Mark the option which correctly differentiates between solar and lunar eclipse: A. When the moon comes in between the earth and the sun and if all the three are in same straight line, solar eclipse occurs. And when the earth comes in between the sun and the moon and if all the three are in same straight line, lunar eclipse occurs. B. When the earth comes in between the sun and the moon and if all the three are in same straight line, solar eclipse occurs. And, when the earth comes in between the sun and the moon and if all the three are in same straight line, lunar eclipse occurs. C. Both A and B are wrong. D. Sun’s shadow causes solar eclipse and moon’s shadow causes lunar eclipse. | 12 |

725 | An air bubble is inside water. The refractive index of water is ( frac{4}{3} . ) At what distance from the air bubble should a point object be placed so as to form a real image at the same distance from the bubble? A . 2 R B. 3R c. 4 R D. The air bubble cannot form a real image | 12 |

726 | The ( X-Z ) plane separates two media ( A ) and ( B ) of refractive indices ( mu_{A}=1.5 ) and ( mu_{B}=2 . ) A ray of light travels from ( A ) to ( B ), its direction in two media are given by unit vectors. ( hat{boldsymbol{u}}_{boldsymbol{A}}=boldsymbol{a} hat{boldsymbol{i}}+boldsymbol{b} hat{boldsymbol{j}} ) and ( hat{boldsymbol{u}}_{B}=boldsymbol{c} hat{boldsymbol{i}}+boldsymbol{d} hat{boldsymbol{j}} ) respectively, then : ( ^{A} cdot frac{a}{c}=frac{4}{3} ) B. ( frac{a}{c}=frac{3}{4} ) c. ( frac{b}{d}=frac{4}{3} ) D. ( frac{b}{d}=frac{3}{4} ) | 12 |

727 | What happens to the size of the image of the flame formed on the screen? | 12 |

728 | Fill in the blanks The eye lens can change its focal length due to working of muscles. | 12 |

729 | How are non luminous objects visible to eye? A. Non-luminous objects give away light B. Non-luminous objects reflect the light falling on them C. Non-luminous objects disperse the light falling on them D. None of the above | 12 |

730 | When a lens is inserted between an object and a screen which are at a fixed distance apart, the size of the image in either ( 6 mathrm{cm} ) and ( 2 / 3 mathrm{cm} ). The size of the object in cm is then ( A cdot 9 ) B. 4 ( c cdot 3 ) D. | 12 |

731 | A small piece of wire bent into L shape such that the upright and horizontal portions are of equal length. It is placed with the horizontal portion along the axis of concave mirror of radius of curvature ( 20 mathrm{cm} ). If the bend is ( 40 mathrm{cm} ) from the pole of the mirror, then the ratio of the length of the images of the upright and horizontal portions of the wire is A ( cdot 1: 9 ) в. 1: 3 ( c cdot 3: ) ( D cdot 2: ) | 12 |

732 | Which principle is the basis for the transmission of light through fiber optic cables even if the cable is bent? A. Photoelectric effect B. Uncertainty principle c. Light diffraction D. Light polarization E. Total internal reflection | 12 |

733 | A short linear object of length ( boldsymbol{I} ) lies along the axis mirror of focal length ( boldsymbol{F} ) at a distance u form the of the mirror. The size of the image is approximately equal to: ( ^{mathbf{A}} cdotleft(frac{u-f}{f}right)^{1 / 2} ) ( ^{mathrm{B}} cdot_{I}left(frac{u-f}{f}right)^{2} ) ( ^{mathrm{c}} cdotleft(frac{f}{u-f}right)^{1 / 2} ) D. ( _{I}left(frac{f}{u-f}right) ) | 12 |

734 | Lenses of power ( 3 D ) and ( -5 D ) are combined to from a compound lens.An object is placed at a distance of ( 50 mathrm{cm} ) from this lens. The position of its image will be; – ( A cdot-10 mathrm{cm} ) ( B .+10 mathrm{cm} ) ( c .-25 mathrm{cm} ) ( D cdot+25 mathrm{cm} ) | 12 |

735 | (a) Define the power of lens. (b) Draw a ray diagram for formation of image of an object situated at a point in between ( 2 f_{1} ) and ( f_{1} ) distances from the optical centre of the concave lens and write the nature of the image formed. (c) What happens when light is falling perpendicular to an interface of two media? | 12 |

736 | 46. An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the same lens, the image formed is virtual. If the sizes, of the images formed are equal, the focal length of the lens will be (a) 15 cm (b) 17 cm (c) 21 cm (d) 11 cm | 12 |

737 | State whether the given statement is True or False. An eye is said to be long-sighted, if the image of a distant object is formed in front of retina. | 12 |

738 | If the wavelength of light is ( 4000 A ), then the number of waves in 1 mm length will be A . 2500 B . 25 ( c .250 ) D. 25000 | 12 |

739 | Name the two major defects of an eye. Explain causes of their development and discuss methods of their correction. | 12 |

740 | How should people wearing spectacles work with a microscope? A. They should keep on wearing their spectacles B. They should never use the microscope C. They should take off their spectacles D. They may either put on their spectacles or they may take off their spectacles | 12 |

741 | A man can see objects clearly up to ( 3 m ) What type of lens he should use in order to see clearly up to ( 12 m ? ) A. Convex lens, ( f=4 m ) B. Concave lens, ( f=4 m ) c. convex lens, ( f=-4 m ) D. Concave lens, ( f=-4 m ) | 12 |

742 | A small pin fixed on a table top is viewed from above from a distance of ( 50 mathrm{cm} . ) By what distance would the pin appear to be raised if it is viewed from the same point through a ( 15 mathrm{cm} ) thick glass slab held parallel to the table? Refractive index of glass ( =1.5 . ) Does the answer depend on the location of the slab? | 12 |

743 | Assertion The maximum refractive index of liquid for total internal reflection of the ray passing through the prism should be ( sqrt{2} ) Reason Here critical angle is ( 45^{circ} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

744 | Which surfaces are said to be smooth? A. As long as the irregularities of surfaces are small as compared to the wavelength of the incident light. B. As long as surface irregularities are large compared to the wavelength of the incident light C. As long as surface smoothness are small as compared to wavelength of reflected light D. As long as the surface irregularities are large as compared to the wavelength of reflected light. | 12 |

745 | thickness and refractive index ( n_{1}=1.4 ) is coated on the convex spherical surface of radius ( R ) at one end of a long solid glass cylinder of refractive index ( boldsymbol{n}_{2}=1.5, ) as shown in the figure. Rays of light parallel to the axis of the cylinder traversing through the film from air to glass get focused at distance ( f_{1} ) from the film, while rays of light traversing from glass to air get focused at distance ( f_{2} ) from the film. Then This question has multiple correct options ( mathbf{A} cdotleft|f_{1}right|=3 R ) B . ( left|f_{1}right|=2.8 R ) ( mathbf{c} cdotleft|f_{2}right|=2 R ) D cdot ( left|f_{2}right|=1.4 R ) | 12 |

746 | A fish looks upward at an unobstructed overcast sky. What total angle does the sky appear to subtend? (Take refractive index of water as ( sqrt{2} ) ). ( mathbf{A} cdot 180 ) B. 90 ( c cdot 75 ) D. ( 60^{circ} ) | 12 |

747 | The far point of a myopic person is 40 cm. To see the distant objects clearly, the focal length and the power of the lens used should be: A. ( -40 mathrm{cm},-2.5 mathrm{D} ) B. ( -25 mathrm{cm},-4.0 mathrm{D} ) ( c cdot+40 mathrm{cm},+2.5 mathrm{D} ) D. ( -40 mathrm{cm},+2.5 mathrm{D} ) | 12 |

748 | Braille writer slate and stylus is a type of resource for blind people that is called tactual aid A. True B. False | 12 |

749 | The velocity of electromagnetic radiation in a medium of permittivity ( varepsilon_{0} ) and permeability ( mu_{0} ) is given by : A ( cdot sqrt{frac{varepsilon_{0}}{mu_{0}}} ) B . ( sqrt{mu_{0} varepsilon_{0}} ) c. ( frac{1}{sqrt{mu_{0} varepsilon_{0}}} ) D. ( sqrt{frac{mu_{0}}{varepsilon_{0}}} ) | 12 |

750 | If we want to see our full image then the minim um size of the plane mirror A. Should be twice of our height B. Should be of our height c. should be half of our height D. Depends upon our distance from mirror | 12 |

751 | Distance between focus and optical centre of a lens is called A. Focal plane B. Focal length c. Focus D. Principal axis | 12 |

752 | decomposes white light into its constituent colors. A. Flat glass slab B. Convex mirror c. Concave mirror D. Prism | 12 |

753 | A convex lens of focal length ( 0.2 mathrm{m} ) and made of glass ( left(^{a} mu_{g}=1.5right) ) is immersed in water ( left(^{a} mu_{w}=1.33right) . ) Find the change in the focal length of the lens. ( A cdot 5.8 mathrm{m} ) B. 158 m c. ( 0.58 mathrm{m} ) D. ( 5.8 mathrm{cm} ) | 12 |

754 | What is the angle of deviation produced by a glass slab? Explain with ray diagram. | 12 |

755 | 78. A ray of light enters a rectangular glass slab of refractive index V3 at an angle of incidence 60°. It travels a distance of 5 cm inside the slab and emerges out of the slab. The perpendicular distance between the incident and the emergent rays is (a) 513 cm (b) 5 cm (c) 563/2 cm (d) 5 cm | 12 |

756 | Four rays, 1,2,3 and 4 are incident normally on the face ( P Q ) of an isosceles prism PQR with apex angles ( angle Q=120^{circ} ) The refractive indices of the material of the prism for the above rays 1,2,3 and 4 are 1.85,1.96,2.05 and ( 2.15, ) respectively and the surrounding medium is air. Then the rays emerging from the face QR are : A. 4 only B. 1 and 2 only c. 3 and 4 only D. 1,2,3 and 4 | 12 |

757 | A ray of light passes from glass, having a refractive index of ( 1.6, ) to air. The angle of incidence for which the angle of refraction is twice the angle of incidence is A ( cdot sin ^{-1}left(frac{4}{5}right) ) в. ( sin ^{-1}left(frac{3}{5}right) ) ( ^{mathbf{c}} cdot sin ^{-1}left(frac{5}{8}right) ) D. ( sin ^{-1}left(frac{2}{5}right) ) | 12 |

758 | What type of lens from the following would you have in your magnifying lens to read a page in small print? A. A convex lens of focal length ( 80 mathrm{cm} ) B. A concave lens of focal length 80 cm c. A concave lens of focal length ( 4 mathrm{cm} ) D. A convex lens of focal length of ( 4 mathrm{cm} ) | 12 |

759 | Which of the following is responsible for glittering of diamond. A . Interference B. Diffraction c. Total internal reflation D. Refraction | 12 |

760 | Two plane mirrors are inclined to each other at an angle ( theta . ) A ray of light is reflected first at one mirror and then at the other. The total deviation of the ray is A ( cdot 360^{circ}-2 theta ) B. ( 240^{circ}-20 ) c. 20 D. ( 180^{circ}-theta ) | 12 |

761 | The adjoining figures represent three cases of a ray passing through a prism of an angle ( A ). Which of the following figure represents the minimum deviation condition A. B. 2 ( c .3 ) D. None of these | 12 |

762 | State whether true or false: The deviation produced by a prism is independent of the angle of incidence and is same for all the colours of light. A . True B. False | 12 |

763 | A compound microscope has an objective of focal length ( 4 mathrm{mm} ) and an eyepiece of focal length ( 25 mathrm{mm} ). The objective produces a real image at a distance of ( 180 mathrm{mm} ). If the eye-piece is in normal adjustment, then the magnification is A . 45 B. 90 ( c cdot 225 ) D. 440 | 12 |

764 | Due to refraction, sunrise appears sun comes to horizon and sunset appears sun leaves horizon respectively. A. before, after B. after, before c. before, before D. after, after | 12 |

765 | Give reasons. In old age bifocal lens is necessary for person. | 12 |

766 | Assertion Optical fibres are used for telecommunication. Reason Optical fibres are based on the phenomenon of total internal reflection. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

767 | Calculate the critical angle between glass and air. (Given ( left._{a} mu_{g}=frac{3}{2}right) ) A . 41.8 в. 45.8 c. 45 D. 30 | 12 |

768 | Assertion If light enters from medium- 1 into medium-2 and bends towards the normal, its wavelength in medium-2 is smaller than its wavelength in medium- 1 Reason According to Cauchy’s relation, ( mu= ) ( A+frac{B}{lambda^{2}} ) A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 12 |

769 | A microscope has an objective of focal length ( 1.5 mathrm{cm} ) and eye piece of focal length ( 2.5 mathrm{cm} . ) If the distance between objective and eye-piece is ( 25 mathrm{cm} ). What is the approximate value of magnification produced for relaxed eye? [Disclaimer: Option A is changed from ( mathbf{7 5} ) to ( mathbf{1 8 3 . 3 3} ) as the correct answer is 183.33 which is not present in the given options.] A . 183.33 B. 110 c. 140 D. 25 | 12 |

770 | A reflecting surface is curved inwards. Now, the mirror formed is : A. Concave B. convex c. Plane D. None of these | 12 |

771 | 33. A plastic hemisphere has a radius of curvature of 8 cm and an index of refraction of 1.6. On 8 cm the axis halfway between the plane surface and the spherical 4 cm one (4 cm from each) is a small object O. The distance between the two images when viewed along the axis from the two sides of the hemisphere is approximately (a) 1.0 cm mit (b) 1.5 cm (c) 3.75 cm (d) 2.5 cm | 12 |

772 | A glass prism with a refracting angle of ( 60^{0} ) has a refractive index 1.52 for red and 1.6 for voilet light.A parallel beam of white light is incident on one face at an angle of incidence, which gives minimum deviation for red light. Find: ( left[boldsymbol{U} boldsymbol{s} boldsymbol{e}: sin left(mathbf{5 0}^{0}right)=mathbf{0 . 7 6 0} ; sin left(mathbf{3 1 . 6}^{mathbf{0}}right)=mathbf{0}right. ) 2.The angular width of the spectrum is; A ( .6^{circ} ) B . ( 4.8^{circ} ) c ( cdot 9.6^{circ} ) D. ( 12^{circ} ) | 12 |

773 | A convex mirror has a focal length ( f . mathbf{A} ) real object is placed at a distance ( f ) in front of it from the pole, produces an image at: ( A cdot infty ) B. ( f ) ( c cdot frac{f}{2} ) D. ( 2 f ) | 12 |

774 | The light which refracts most while passing through a prism is A . Red B. Violet c. Indigo D. Yellow | 12 |

775 | A point ‘ ( O^{prime} ) marked on the surface of a glass sphere of diameter ( 20 mathrm{cm} ) is viewed through glass from the position directly opposite to the point ‘ ( O ) ‘. If the refractive index of the glass is ( 1.5, ) find the position of the image formed. Also, draw the ray diagram for the formation of the image. | 12 |

776 | State two uses of : Irregular reflection | 12 |

777 | The power of plane mirror is ( mathbf{A} cdot mathbf{0} ) B . ( infty ) ( c .2 D ) D. ( 4 D ) | 12 |

778 | In lateral inversion. A. Right side of the object will be right side of the image B. Left side of the object will be left side of the image C. Upside of the object will be down side of the object D. Right side of the object will be left side of the image | 12 |

779 | A lens of glass is immersed in water. What will be its effect on the power of the lens? | 12 |

780 | Find the power (with sign) of a concave lens of focal length ( 20 mathrm{cm} ) A . ( -4 D ) в. ( -5 D ) ( c .4 D ) D. ( 5 D ) | 12 |

781 | The frequency of a light wave in a material is ( 2 times 10^{14} H z ) and wavelength is 5000 A. The refractive index of material will be : A . 1.50 B. 3.00 ( c .1 .33 ) D. 1.40 | 12 |

782 | Light falls from glass to air. Find the angle of incidence for which the angle of deviation is ( 90^{circ} . ) If refractive index of glass is ( sqrt{2} ) | 12 |

783 | We want a mirror that will make an object look larger. What combination of image and object distances (from the mirror) will accomplish this? A. Image Distance ( 3.0 mathrm{cm} ), Object Distance ( 3.0 mathrm{cm} ) B. Image Distance ( 2.0 mathrm{cm} ), Object Distance ( 3.0 mathrm{cm} ) C. Image Distance ( 3.0 mathrm{cm} ), Object Distance ( 5.0 mathrm{cm} ) D. Image Distance ( 3.0 mathrm{cm} ), Object Distance ( 2.0 mathrm{cm} ) E. Image Distance ( 3.0 mathrm{cm}, ) Object Distance ( 10.0 mathrm{cm} ) | 12 |

784 | A beam of light consisting of red, green and blue is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39 1.44 and 1.47 respectively. The prism will A. separate part of the red color from the green and blue colors B. separate part of the blue color from the red and green colors c. Separate all the three colors from the other two colors D. not separate even partially any color from the other two colors | 12 |

785 | Which part of the eye is a dark muscular diaphragm? A. Iriss B. Cornea c. Pupil D. Retina | 12 |

786 | For paraxial rays, show that the focal length of a spherical mirror is one-half of its radius of curvature. | 12 |

787 | a distance ( L ) in front of the centre of a mirror of width ( d ), hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance ( 2 L ) from it as shown in the figure. The greatest distance over which he can see the image of the light source in the mirror is : ( mathbf{A} cdot d / 2 ) B. ( d ) c. ( 2 d ) D. ( 3 d ) | 12 |

788 | 82. A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L, or L, having refractive indices n, and n2, respectively (n2>n, > 1). The lens will diverge parallel beam of light if it is filled with (a) air and placed in air (b) air and immersed in Li (c) L, and immersed in L2 (d) L and immersed in L | 12 |

789 | The electromagnetic waves travel with a velocity A. equal to velocity of sound. B. equal to velocity of light c. less than velocity of light D. None of the above | 12 |

790 | ( fleft(mu_{0}=sqrt{2} ) and the rayjust fail to right. emerge from the prism, refractive index ( mu ) of the solid will be ( A cdot 1.2 ) B. ( sqrt{2} ) ( c ) D. ( sqrt{3} / 2 ) | 12 |

791 | The equiconvex lens has focal length ‘f. If it is cut perpendicular to the principal axis passing through optical centre, then focal length of each half is : A ( cdot frac{f}{2} ) B. ( f ) ( c cdot frac{3 f}{2} ) D. ( 2 f ) | 12 |

792 | The type of lens present in human eye is A. Convex lens B. Concave lens c. Plano convex lens D. Plano concave lens | 12 |

793 | 1 . 18. The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10 cm more distance from the mirror than the object. The magnification of the image is (a) 8/3 centro. (b) 2.5 (c) 2 (d) -1.5 | 12 |

794 | A ray of light is incident on a plane mirror and the angle of reflection is ( 50^{circ} ) Calculate the angle between the incident ray and the reflected ray. A ( .50^{circ} ) B . ( 25^{circ} ) ( c cdot 90^{circ} ) D. ( 100^{circ} ) | 12 |

795 | The focal lengths of the objective and eyepiece of a compound microscope are ( 2 mathrm{cm} ) and ( 3 mathrm{cm} ) respectively. The distance between the objective and eyepiece is ( 15 mathrm{cm} . ) The final image formed is at infinity. The distances in cm of object and image from objective are going to be then: ( A cdot 2.4 ) and 12 B. 2.4 and 15 c. 2.3 and 3.0 D. 2.3 and 12 | 12 |

796 | The plane of a mirror makes an angle ( 30^{circ} ) with borizontal. If any vertical ray is incident on the mirror, then angle made by the reflected ray on plane mirror will be- ( A cdot 30 ) B . 45 ( c cdot 60 ) D. ( 90^{circ} ) | 12 |

797 | The centre of curvature of a ….. mirror is behind it. A. convex B. Concave c. convex or concave D. None of these | 12 |

798 | The wavelength and frequency of beam of light in water of refractive index ( 4 / 3 ) having wavelength 0.48 micron in air are A. ( 0.16 times 10^{-6} m, 6.25 times 10^{14} H z ) В. ( 0.36 times 10^{-6} m, 6.25 times 10^{14} H z ) c. ( 0.36 times 10^{-6} m, 3.25 times 10^{14} H z ) D. ( 0.26 times 10^{-6} m, 6.25 times 10^{14} H z ) | 12 |

799 | Which of the following occurs when light is reflected from a smooth flat glass surface, as shown above? A. The light is somewhat intensified B. The light is somewhat polarized C. The light is focused D. The velocity of the light is reduced E. The color of the light is shifted toward the blue end of the spectrum. | 12 |

800 | A boy rotates his arm in clockwise direction in front of mirror. His mirror image rotates its arm in: A. anticlockwise direction B. clockwise direction c. oscillatory motion D. insufficient info | 12 |

801 | A parallel beam of light is incident from air at an angular ( alpha ) on the side PQ of a right – angled triangular prism of refractive index ( n=sqrt{2} ) Light undergoes total internal reflection in the prism at the face PR when ( alpha ) has a minimum value of ( 45^{circ} . ) The angle ( theta ) of the prism is A ( cdot 15^{circ} ) В ( cdot 22.5^{circ} ) ( c cdot 30^{circ} ) D. ( 45^{circ} ) | 12 |

802 | The figure shows a mixture of blue, green and red colour ray incident on the right angled prism. The critical angles of the material of prism for red, green and blue colours are ( 46^{circ}, 44^{circ} ) and ( 43^{circ} ) respectively. The arrangement will separate: A. red colour from green and blue B. blue colour from green and red c. green colour from red and blue D. all the three colours | 12 |

803 | ABC represents the principal cross- section of an equilateral prism made with a transparent material. If PQRS indicates the path of a light ray, find the refractive index of the material. A ( cdot frac{1}{sqrt{2}} ) B. ( frac{2}{sqrt{3}} ) ( c cdot sqrt{2} ) D. ( frac{sqrt{3}}{2} ) | 12 |

804 | Draw a labelled diagram to show ( (i) ) reddish appearance of the sun at the sunrise or the sunset | 12 |

805 | A ray of light incident parallel to the base PQ of an isosceles right-angled triangular prism PQR suffers two successive total internal reflections at the faces ( mathrm{PQ} ) and ( mathrm{QR} ) before reversed in direction as shown. If the refractive index of the material of the prism is ( mu, ) then find the value of ( mu ) | 12 |

806 | Any ray which passes through the point is not deviated by the lens. 4 ( B ) ( c .2 ) Don | 12 |

807 | Resolving limit of a healthy eye is | 12 |

808 | A convex lens has focal length ( 30 mathrm{cm} ). If an object is placed at a distance of 15 ( mathrm{cm} ) from it then the magnification produced by the lens is? A . 6.66 B. 0.5 c. 1 ( D ) | 12 |

809 | A ray of light is incident on glass slab making an angle of incidence ( sin ^{-1}left(frac{sqrt{3}}{2}right) . ) What will be the angle of refraction in glass of refractive index 1.5? ( mathbf{A} cdot 40^{circ} 18 ) В ( cdot 24^{circ} 49^{prime} ) c. ( 25^{circ} ) о ( 7^{text {। }} ) ( mathbf{D} cdot 35^{circ} 16^{prime} ) | 12 |

810 | A ray of light is incident normally on one face of a ( 30^{circ}-60^{circ}-90^{circ} ) prism of refractive index ( frac{mathrm{t}}{text { imersed in water of }} ) ( mathbf{Z} ) refractive index ( frac{-}{2} ) as shown ( overline{mathbf{3}} ) This question has multiple correct options A ( cdot ) the exit angle ( theta_{2} ) of the ray is ( sin ^{-1}left(frac{5}{8}right) ) B ( cdot ) the exit angle ( theta_{2} ) of the the ray is ( sin ^{-1}left(frac{5}{4 sqrt{3}}right) ) C. total internal reflection at point P ceases if the refractive index of water is increased to ( frac{5}{2 sqrt{3}} ) by dissolving some substance D. Total internal reflection at point P ceases if the refractive index of water is increased to ( frac{-b y}{y} ) dissolving some substance. | 12 |

811 | Refraction of light in the eye occurs at A. The pupil only B. The cornea only c. The lens only D. Both the cornea and the lens | 12 |

812 | The plane side of a thin plano-convex lens with radius of curvature ( 20 mathrm{cm} ) is silvered to obtain a concave mirror. An object is located at a distance of ( 25 mathrm{cm} ) in front of this mirror. The distance of the image from the mirror is ( (mu=1.5) ) A . ( 100 mathrm{cm} ) в. ( frac{100}{11} mathrm{cm} ) ( c cdot 6.25 c m ) D. ( frac{100}{9} mathrm{cm} ) | 12 |

813 | A simple microscope consists of a concave lens of power ( 10 mathrm{D} ) and a convex lens of power 15 D. Its magnification at near point is (least distance of distinct vision, ( mathrm{D}= ) ( 25 mathrm{cm} ) A . 2.25 B. 5 ( c cdot 10 ) D. 20 | 12 |

814 | A water drop in air reflects the light rays as ( A ) в. ( c ) ( D ) | 12 |

815 | Derive an expression for the refractive index of the material of a prism. | 12 |

816 | A thin prism of angle ( 5^{circ} ) is placed at a distance of ( 10 mathrm{cm} ) from object. What is the distance of the image from object? (Given ( mu ) of prism ( =1.5 ) ) A ( cdot frac{pi}{8} c m ) в. ( frac{pi}{12} mathrm{cm} ) c. ( frac{5 pi}{36} c m ) D. ( frac{pi}{7} c m ) | 12 |

817 | Differentiate between regular and irregular reflection. | 12 |

818 | What is the ability of the eye lens to adjust its focal length called? | 12 |

819 | The splitting of white light into constituent colors is called | 12 |

820 | A thin prism of angle ( 15^{circ} ) made of glass of refractive index ( mu_{1}=1.5 ) is combined with another prism of glass of refractive index ( mu_{2}=1.75 . ) The combination of the prism produced dispersion without deviation. The angle of the second prism should be : A ( cdot 5^{circ} ) B . ( 7^{circ} ) ( c cdot 10^{circ} ) D. ( 12^{circ} ) | 12 |

821 | A student uses a converging lens to produce an enlarged virtual image of a scale she wishes to read accurately. The focal length of the lens is ( 10 mathrm{cm} ). What is a suitable distance between the scale and the lens? ( A cdot 8 c m ) B. ( 10 mathrm{cm} ) ( mathrm{c} cdot 15 mathrm{cm} ) D. ( 20 mathrm{cm} ) | 12 |

822 | An object, ( 1 m ) tall, is put in front of a plane mirror at a distance of 0.2 m.The size of the image formed is: A. ( 0.2 m ) в. ( 0.5 m ) ( mathrm{c} .0 .1 mathrm{m} ) D. ( 1 m ) | 12 |

823 | Laws of reflection hold good for A. Plane mirrors B. Concave mirrors c. Convex mirrors D. All | 12 |

824 | In snells law ( mu_{1} sin theta_{1}=mu_{2} sin theta_{2} ) Type 1 for true and 0 for flase | 12 |

825 | An electromagnetic wave of frequency ( boldsymbol{v}=mathbf{3 . 0} boldsymbol{M} boldsymbol{H} boldsymbol{z} ) passes from vacuum into a dielectric medium with permittivity ( epsilon=4.0 . ) Then A. wavelength is halved and frequency remains unchanged. B. wavelength is doubled and frequency becomes half. C. wavelength is doubled and frequency remains unchanged. D. wavelength and frequency both remain unchanged. | 12 |

826 | The path of beam of light becomes in a colloidal solution. A . visible B. invisible c. white D. dispersed | 12 |

827 | The magnification produced by a plane mirror is ( +1 . ) What does this mean? | 12 |

828 | Which of the following phenomenon has two angles that are equal to each other? A. Reflection B. Refraction c. Diffraction D. constructive interference E. Destructive interference | 12 |

829 | If the focal length of a lens is ( 50 mathrm{cm} ), its power would be A. 50 dioptres B. 2 dioptres c. 20 dioptres D. 0.5 dioptres | 12 |

830 | What is reflection? Give two examples. | 12 |

831 | The figure above shows the eye suffering from: A. hypermetropia B. myopia C . astigmatism D. far-sightedness | 12 |

832 | By which optical phenomena the splitting of white light into seven constituent colours occur? A. Refraction B. Dispersion c. Reflection D. Interference | 12 |

833 | Read the given statements and select the correct option. Statement 1: Rahul placed a coloured plastic bottle in front of the beam of a Statement 2: Translucent objects allow | 12 |

834 | Assertion: In optical fibre, the diameter of the core is kept small. Reason: This smaller diameter of the | 12 |

835 | You are standing upright in a room in front of a vertical mirror. In this mirror, you can see from your position, only the upper two- third part of your body. You wish to see the full image of your body in the mirror. Which combination of the following three courses of action will achieve this? I. Move away from the mirror II. Move towards the mirror III. Use a mirror whose height will allow you to see your full image A. I only B. II only c. III only D. Either I or III | 12 |

836 | According to the laws of reflection, angle of incidence is equal to angle of reflection A. True B. False | 12 |

837 | Inability of the eye to focus on both far and near objects with advancing age is: A. Astigmatism B. Presbyopia c. Myopia D. Hypermetropia | 12 |

838 | What is lens ( B ) called? Parallel point of distant | 12 |

839 | A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? | 12 |

840 | A straight line graph is obtained by plotting sine of angle of incidence versus sine of angle of refraction. The slope of this graph represents: A. Velocity of light B. Refractive index c. Gravitational D. None of these | 12 |

841 | You are given prisms made of crown glass and flint glass with a wide variety of angles. Suggest a combination of prisms which will (a) deviate a pencil of white light without much dispersion, (b) disperse (and displace) a pencil of white light without much deviation. | 12 |

842 | Light in air is incident at an angle of ( 45^{circ} ) on the surface of glass plate having Refractive index 1.526 through what angle is light deviated upon refraction at top of surface. | 12 |

843 | The focal length of a glass slab of refractive index 1.5 is A . Infinite B. Zero c. Unity D. None of these | 12 |

844 | A prism of refractive index ( sqrt{2} ) has refracting angle ( 60^{0} ). Angle of minimum deviation is: A ( cdot 45^{circ} ) В. ( 90^{circ} ) ( c cdot 30^{0} ) D. none | 12 |

845 | A double convex lens made of glass has both radii of curvature of magnitude 20 cm. Incident light rays parallel to the axis of the lens will converge at a distance at [Given refractive index of glass ( =1.5] ) A . 20 B. 10 ( c cdot 40 ) D. ( frac{40}{3} ) | 12 |

846 | A point source of light is moving at a rate of ( 2 mathrm{cm}-s^{-1} ) towards a thin convex lens of focal length ( 10 mathrm{cm} ) along its optical axis. When the source is ( 15 c m ) away from the lens the image is moving at A ( cdot 4 mathrm{cm}-s^{-1} ) towards the lens B. ( 8 mathrm{cm}-s^{-1} ) towards the lens C. ( 4 mathrm{cm}-s^{-1} ) away from the lens D. ( 8 mathrm{cm}-s^{-1} ) away from the lens | 12 |

847 | What is meant by refraction of light? State the laws of refraction. | 12 |

848 | What gives a perception of depth or three dimensional vision to human eye? | 12 |

849 | An object ( 2.5 mathrm{cm} ) high is placed at a distance of ( 10 mathrm{cm} ) from a concave mirror of radius of curvature ( 30 mathrm{cm} . ) The size of the image is: ( mathbf{A} cdot 9.2 mathrm{cm} ) в. ( 10.5 mathrm{cm} ) c. ( 5.6 mathrm{cm} ) D. ( 7.5 mathrm{cm} ) | 12 |

850 | Long-sightedness is to hypermetropia as short-sightedness is to : A. myopia B. focusing c. astigmatism D. accomodation | 12 |

851 | Which of the following phenomena cannot be explained by scattering of light ? A. Blue colour of sky B. Colour of clouds c. Tyndall effect D. Formation of rainbow | 12 |

852 | A thin plano convex lens of focal length ( f, ) is split into two halves. One of the halves is shifted along the principal axis as shown. The separation between an object placed on the axis and its image is ( 1.8 m ) The magnification of the image formed by one of the half lenses is 2 . Find the focal length of the combination and the separation between the two halves. ( A cdot 0.4 m ) B. ( 0.5 mathrm{m} ) c. ( 0.6 mathrm{m} ) D. ( 0.7 mathrm{m} ) | 12 |

853 | A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason. | 12 |

854 | A ray of light travels from a denser to a rarer medium then, the ray: A. doesn’t bend at all B. bends towards the normal c. bends away from the normal D. goes along the normal | 12 |

855 | Answer the question in the limit of maximum 50 words. Describe the dispersion of light by glass prism with neat figure. | 12 |

856 | A double convex lens is made of glass which has refractive index 1.55 for violet rays and 1.50 for red rays. If the focal length of violet rays is ( 20 mathrm{cm}, ) the focal length for red rays is : A. ( 9 mathrm{cm} ) B. ( 18 mathrm{cm} ) c. ( 20 mathrm{cm} ) D. 22 cm | 12 |

857 | If the angle of incidence is ( 70^{circ}, ) then calculate the angle between the incidence ray and the reflected ray. A ( .50^{circ} ) B . ( 140^{circ} ) ( mathrm{c} cdot 130^{circ} ) D. ( 80^{circ} ) | 12 |

858 | A point source of light is placed at the bottom of a water lake. If the area of the illuminated circle on the surface is equal to 3 times the square of the lake. The refractive index of water is A. ( sqrt{pi+1} ) B. ( sqrt{frac{pi}{3}+1} ) c. ( frac{pi}{3}+1 ) D. ( frac{pi}{4}+1 ) | 12 |

859 | Which of the following is true for cornea? A. It allows light to enter the eye B. Most of the refraction of light occurs on the outer surface of cornea C. It forms a transparent bulge on the outer surface of the eyeball. D. All of the above | 12 |

860 | Draw the diagram that explains the formation of an image by a plane mirror. | 12 |

861 | Read the statements and mark the correct one: i. It has 63 dot patterns or characters. ii. through Braille system,visually challenged people can only read the languages. iii. It is a coded language based on logical system B. i, ii c. ii, ii D. All are true | 12 |

862 | A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. If the distance between parallel walls and lens is ( ^{prime} d^{prime} ) then, required focal length of lens placed in between the walls is: A ( cdot ) only ( frac{d}{4} ) B. only ( frac{d}{2} ) c. More than ( frac{d}{4} ) but less than ( frac{d}{2} ) D. Less than or equal to ( frac{d}{4} ) | 12 |

863 | Two thin lenses of powers ( 2 D ) and ( 3 D ) are placed in contact. An object is placed at a distance of ( 30 mathrm{cm} ) from the combination. The distance (in cm) of the image from the combination is : A . 30 B. 40 ( c .50 ) D. 60 | 12 |

864 | Which of the following statement is correct? A. A person with myopia can see distant objects clearly B. A person with hypermetropia can see nearby objects clearly C. A person with myopia can see nearby objects clearly D. A person with hypermetropia cannot see distant objects clearly | 12 |

865 | ( frac{sqrt{x}}{frac{x}{x}} ) | 12 |

866 | A point object is placed at a distance of ( 12 mathrm{cm} ) on the axis of a convex lens of focal length ( 10 mathrm{cm} . ) On the other side of the lens, a convex mirror is placed at a distance of ( 10 mathrm{cm} ) from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is ( A cdot 20 mathrm{cm} ) B. 25 cm ( c . ) 30 ( mathrm{cm} ) D. 22 cm | 12 |

867 | Assertion Although the surface of goggles’ lens is curved, it does not have any optical power. Reason In case of goggles, both the curved surfaces have equal radii of curvature and have centre of curvature on the same side. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion C. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

868 | Two lenses of power ( 10 D ) and ( -10 D ) are in contact, find power, focal length and nature of lens combination. | 12 |

869 | When the plane surface of a planoconvex lens of refractive index 1.5 is silvered, it behaves like a concave mirror with ( boldsymbol{f}=mathbf{3 0} ) cm.When its convex surface is silvered, it will behave like a concave mirror of focal length: ( mathbf{A} cdot 10 mathrm{cm} ) B. ( 20 mathrm{cm} ) c. ( 30 mathrm{cm} ) D. ( 45 mathrm{cm} ) | 12 |

870 | Cataract is a condition of eye when: A. eye sight becomes foggy B. eye lens becomes cloudy C. there is a loss of vision D. all of the above | 12 |

871 | In the absence of atmosphere, the sky appears: A . coloured B. blue c. indigo D. black | 12 |

872 | The sum of the reciprocals of object distance and image distance is equal to the of a mirror. A. focal length B. reciprocal of the focal length c. radius of curvature D. reciprocal of the radius of curvature | 12 |

873 | Larger particles scatter light at the end of the spectrum the least. A. Blue B. Green c. violet D. Red | 12 |

874 | An object ( 10 mathrm{cm} ) from lens, has a virtual image at ( 10 mathrm{cm} ) from the object. The power of the lens is A. 10 diopters B. -10 diopters c. 5 diopters D. – diopters | 12 |

875 | Which of the following describes an object that allows no light to pass through it? A. Transparent в. ०раяче c. Translucent D. Diffuse | 12 |

876 | Fill in the blanks: An aged person suffering from caused by the weak accommodation power of the eye lens associated with old age, should wear lenses. A. Myopia, concave B. Hypermetropia, convex c. Presbypoia, bifocal D. Astigmastism, cylindrical | 12 |

877 | A convex lens forms an image of an object on a screen. The height of the image is ( 9 mathrm{cm} . ) The lens is now displaced until an image is again obtained on the screen. The height of this image is ( 4 mathrm{cm} . ) The distance between the object and the screen is 90 ( mathrm{cm} ) A. The distance between the two positions of the lens is 30 ( mathrm{cm} ) B. The distance of the object from the lens in its first position is 36 ( mathrm{cm} ) c. The height of the object is ( 6 mathrm{cm} ) D. The focal length of the lens is 21.6 ( mathrm{cm} ) | 12 |

878 | A ray of light traveling in water is incident on its surface open to the air. The angle of incidence is ( theta, ) which is less than the critical angle. Then there will be A. Only a reflected ray and no refracted ray B. Only a refracted ray and no reflected ray C. A reflected ray and a refracted ray and the angle between them would be less than ( 180^{circ}-2 theta ) D. A reflected ray and a refracted ray and the angle between them would be greater than ( 180^{circ}-2 theta ) | 12 |

879 | State Snells law. Calculate the velocity of light in a glass block of refractive index 1.5 (Velocity of light in air ( left.=3 times 10^{8} m s^{-1}right) ) | 12 |

880 | Fill in the blanks: The reflecting surface of a spherical mirror may be curved | 12 |

881 | When an equiconvex lens ( left(mu_{text {lens}}=mathbf{1 . 5}right) ) is placed over a plane mirror as shown, then object needle and its image coincide at ( 15 mathrm{cm} . ) When a liquid of refractive index ( mu ) is filled in the gap between mirror and lens, the object needle and its image coincide at ( 40 mathrm{cm} ) Find the refractive index ( mu ) of the liquid. ( A cdot 8 ) 5 B. 5 8 ( c cdot frac{13}{8} ) D. ( frac{5}{13} ) E ( cdot frac{13}{5} ) | 12 |

882 | The optical length of an astronomical telescope with magnifying power of 10 for normal vision is ( 44 mathrm{cm} . ) What is focal length of the objective? A. ( 40 mathrm{cm} ) B. 22cm ( c cdot 10 c m ) D. ( 4 mathrm{cm} ) | 12 |

883 | Assertion Although the surfaces of goggle lenses are curved, it does not have any power Reason In case of goggle, both the curved surfaces have equal radii of curvature and have center of curvature on the same side A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Assertion is incorrect but Reason is correct | 12 |

884 | The angle between incident ray and reflected ray is ( 60^{circ} . ) What is the value of angle of incidence? A ( .30^{circ} ) B. 60 ( c cdot 120 ) D. None of the above | 12 |

885 | Behind a thin converging lens having both the surfaces of the same radius ( mathbf{1} boldsymbol{c m}, ) a plane mirror has been placed. The image of an object at a distance of ( 40 mathrm{cm} ) from the lens is formed at the same position. What is the refractive index of the lens? A . 1.5 B. ( 5 / 3 ) ( c cdot 9 / 8 ) D. None of these | 12 |

886 | State Snell’s law of refraction of light. | 12 |

887 | Study the following diagrams in which the path of a ray of light passing through a glass prism as traced by four students ( P, Q, R ) and ( S ) is shown. The student who has traced the path correctly is : ( A ) B. ( Q ) ( c . R ) ( D ) | 12 |

888 | The amount of light reflected depends upon A. the nature of material of the object B. the nature of the surface c. the smoothness of the surface D. all the above | 12 |

889 | Rays of light are entering from glass to glycerine. If refractive indexes of glass and glycerine are respectively 1.5 and 1.47, find the refractive index of glycerine with respect to glass. A. 0.03 B. 1.02 ( c cdot 2.20 ) D. 0.98 | 12 |

890 | If the angle of incidence is ( 80^{circ}, ) what will be the angle of reflection with respect to the normal drawn perpendicular at the point of reflection? A . ( 80^{circ} ) B. ( 100^{circ} ) ( c cdot 160^{circ} ) D. ( 20^{circ} ) | 12 |

891 | Draw a labelled ray diagram of a refractive telescope. Deduce an expression of magnifiying power of it. Write two main limitations of a refracting type telescope over a reflecting type telescope. | 12 |

892 | Moon is visible to us because: A. it reflects light B. it refracts light c. it emits light D. it absorbs light | 12 |

893 | 19. A spherical mirror forms an image of magnification 3. The object distance, if focal length of mirror is 24 cm, may be (a) 32 cm, 24 cm (b) 32 cm , 16 cm (c) 32 cm only (d) 16 cm only 11.:. … edno v cm L | 12 |

894 | Prisms are used in binoculars. Collect information why prisms are used in binoculars. | 12 |

895 | A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black (i) The image will be shifted downward ( (i i) ) The image will be shifted upward ( (i i i) ) The image will not be shifted ( (i v) ) The intensity of the image will decrease A. (i) and ( ( (i) ) ) B. (ii) and (iii) c. ( (i i i) ) and ( (i v) ) D. only ( (i v) ) | 12 |

896 | There is a small black dot at the centre C of a solid glass sphere of refractive index ( mu . ) When seen from outside, the dot will appear to be located: A. Away from C for all values of ( mu ) B. At C for all values of ( mu ) c. At ( mathrm{C} ) for ( mu=1.5 ), but away from ( mathrm{C} ) for ( mu neq 1.5 ) D. At C only for ( sqrt{2} leq mu leq 1.5 ) | 12 |

897 | The aperture diameter of a telescope is 5 ( m ). The separation between the moon and the earth is ( 4 times 10^{5} mathrm{km} . ) With light of wavelength of ( 5500 A ), the minimum separation between objects on the surface of moon, so that they are just resolved, is close to? A. ( 60 mathrm{m} ) в. 20 c. 600 m D. 200 m | 12 |

898 | A lens is placed between the source of light and a wall. It forms images of area ( A_{1} ) and ( A_{2} ) on the wall for its two different positions. The area of the source of light is : в. ( frac{A_{1}+A_{2}}{2} ) ( ^{mathrm{c}}left(frac{sqrt{A_{1}}+sqrt{A_{2}}}{2}right)^{2} ) D. None of these | 12 |

899 | The relation between ( u, v ) and ( r ) is: A ( cdot r=frac{2 u v}{u+v} ) B. ( r=frac{2}{u+v} ) c. ( r=frac{2(u+v)}{(u v)} ) D. None of these | 12 |

900 | The retina is a delicate spot that receives images through the eye lens and makes us see the world. If it gets detatched, it is very difficult to join it back. Therefore, eye surgeons use A. Laser-beams for welding the retina B. Sound waves for joining c. Micro-knives for surgery D. Ultraviolet rays for surgery | 12 |

901 | A real image ( , 4 / 5 ) times size of the object is formed ( 18 mathrm{cm} ) from a lens. Calculate the focal length of the lens. | 12 |

902 | The adjoining diagram shows the view through the eyepiece of a prism spectrometer with its slit illuminated by the source of light emitting three wavelengths corresponding to yellow (Y), Green (G) and unknown colour (X). The colour at ( X ) may be: ( mathbf{A} cdot operatorname{Red} ) B. Orange c. Pink D. Blue | 12 |

903 | An object placed at a distance of ( 16 mathrm{cm} ) from first principal focus of convex lens, produces a real image at a distance of ( 36 mathrm{cm} ) from its second principal focus Then the focal length of the lens is : ( mathbf{A} cdot 9 c m ) B. ( 25 mathrm{cm} ) ( mathbf{c} cdot 24 c m ) D. ( 17 mathrm{cm} ) | 12 |

904 | Which of the following foods are rich in Vitamin A? A. Carrot B. Cauliflower c. Green Chillies D. Beans | 12 |

905 | A passenger in an aeroplane shall A. never see a rainbow. B. may see a primary and a secondary rainbow as concentric circles. C. may see a primary and a secondary rainbow as concentric arcs. D. shall never see a secondary rainbow. | 12 |

906 | A person with myopic vision see objects only up to a distance of ( 0.25 mathrm{m} . ) To be able to read a book placed at the distance of ( 0.50 mathrm{m} ) from the eyes, the spectacles needed by this person have power of A . -1.00 B . -1.5 c. – 2.0 ( D ) D. +2.00 | 12 |

907 | The human eye forms the image of an object at its | 12 |

908 | In fig., ( L ) is a converging lens of focal length ( 10 c m ) and ( M ) is a concave mirror of radius of curvature ( 20 mathrm{cm} . ) A point object ( boldsymbol{O} ) is placed in front of the lens at a distance of ( 15 mathrm{cm} . A B ) and ( C D ) are optical axes of the lens and mirror, respectively. Find the distance of the final image formed by this system from the optical center of the lens. The distance between ( C D ) and ( A B ) is ( 1 c m ). | 12 |

909 | When an object is placed ( 20 mathrm{cm} ) from a complex lens then a real image is formed ( 30 mathrm{cm} ) from the lens. Where should the object be placed so that a real image of the same size is formed by the lens. A. object should be placed ( 24 mathrm{cm} ) from the lens. B. object should be placed ( 34 mathrm{cm} ) from the lens. c. object should be placed 14 cm from the lens. D. object should be placed 30 cm from the lens | 12 |

910 | Assertion A convex lens of glass ( (mu=1.5) ) behave as a diverging lens when immersed in carbon disulphide of higher refractive index ( (mu=1.65) ) Reason A diverging lens is thinner in the middle and thicker at the edges. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

911 | Two thin similar convex glass pieces are joined together front to front with its rear portion silvered such that a sharp image is formed ( 20 mathrm{cm} ) from the mirror. When the air between the glass pieces is replaced by water ( left(mu_{W}=4 / 3right), ) then the image formed from the mirror is at a distance of ( A cdot 8 mathrm{cm} ) B. ( 10 mathrm{cm} ) ( c cdot 6 mathrm{cm} ) D. ( 12 mathrm{cm} ) | 12 |

912 | The angle of deviation by a prism is ( left(180^{circ}-2 Aright) . ) Its critical angle will be A ( cdot sin ^{-1}left(tan frac{A}{2}right) ) B. ( left(cot frac{A}{2}right) ) c. ( cos ^{-1}left(cot frac{A}{2}right) ) D. ( cos ^{-1}left(tan frac{A}{2}right) ) | 12 |

913 | A convex lens ( (boldsymbol{f}=mathbf{2 0} boldsymbol{c m}) ) is placed at ( 80 mathrm{cm} ) from a concave mirror. An object is placed at ( 30 mathrm{cm} ) in front the lens such that position of its final image is same or without the mirror. The maximum distance of object and mirror for virtual image to be formed if only mirror is present is: A ( .10 mathrm{cm} ) B. ( 20 mathrm{cm} ) ( c .30 mathrm{cm} ) D. ( 50 mathrm{cm} ) | 12 |

914 | When light rays enter the eye, most of the refraction occurs at the: A. crystalline lens. B. outer surface of the cornea c. iris D. pupil. | 12 |

915 | When an object is placed at a distance of ( 60 mathrm{cm} ) rom a convex spherical mirror, the magnification produced is ( frac{1}{2} . ) Where should the object be placed to get a magnification of ( 1 / 3 ) | 12 |

916 | A thin lens of focal length ( f ) and aperture diameter ( d ) forms an image of intensity ( I . ) If the central part of the aperture upto diameter ( boldsymbol{d} / 2 ) is blocked by an opaque paper, then the new focal length and intensity of image will be A ( cdot frac{f}{2}, frac{l}{2} ) B. ( frac{f}{2}, frac{3}{4} l ) ( c cdot_{f, frac{1}{2}} ) D. ( f, frac{3}{4} l ) | 12 |

917 | What is the difference between concave and convex mirrors? Choose the correct statement? A. Convex mirror is curved outwards and concave mirror is curved inwards B. Focal point is in front of convex mirror and for a concave mirror, it is behind c. centre of curvature is in front of convex mirror and for concave mirror, it is behind D. None of these | 12 |

918 | In the given figure a piano-concave lens is placed on a paper on which a flower is drawn. how far above its actual position does the flower appear to be? ( A cdot 10 mathrm{cm} ) B. ( 15 mathrm{cm} ) ( c cdot 50 mathrm{cm} ) D. none of these | 12 |

919 | In the dispersion of white light from a prism, the violet light is deviated more than the red light because: A. Velocity of violet rays of light is more B. Wavelength of violet rays of light is more c. The frequency of violet rays of light is more D. The refractive index of prism for violet rays of light is more | 12 |

920 | If a newton’s colour disc composed of seven colours is rotated at high speed, it appears as A. Seven coloured disc rotating B. Few colours merge and only three dominant colours are visible c. Colours mix and it appears white D. colours mix giving a sparkling effect | 12 |

921 | A convex refracting surface of radius of curvature ( 20 mathrm{cm} ) separates two media of refractive indices ( 4 / 3 ) and ( 1.60 . ) An object is placed in the first medium ( (mu=4 / 3) ) at a distance of ( 200 mathrm{cm} ) from the refracting surface. The position of the image formed is A . ( 120 mathrm{cm} ) B. 240 cm ( c .100 mathrm{cm} ) D. 60 cm | 12 |

922 | What length of the bottom ( A B ) the man can see? | 12 |

923 | The size of an object as perceived by an eye depends primarily on A. Actual size of the object B. Distance of the object from the eye c. Aperture of the pupil D. Size of the image formed on the retina | 12 |

924 | Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed: (i) between optical centre and principal focus of a convex lens. (ii) anywhere in front of a concave lens. (iii) at ( 2 mathrm{F} ) of a convex lens. State the signs and values of magnifications in the above mentioned cases (i) and (ii). | 12 |

925 | What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise. | 12 |

926 | toppr Q Type your question at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification? (b) In viewing through a magnifying glass, one usually positions ones eyes very close to the lens. Does angular magnification change if the eye is moved back? (c) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power? (d) Why must both the objective and the eyepiece of a compound microscope have short focal lengths? (e) When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece? | 12 |

927 | In which of the following cases will there be no dispersion when sunlight passes ( mathbf{A} ) B. ( c ) D. | 12 |

928 | A planar structure of length L and width Wis made of two different optical media of refractive indices ( n_{1}=1.5 ) and ( n_{2}=1.44 ) as shown in figure. If ( L> ) ( >W, ) a ray entering from end ( A B ) will emerge from end ( mathrm{CD} ) only if the total internal reflection condition is met inside the structure. For ( boldsymbol{L}=mathbf{9 . 6 m}, ) if the incident angle ( theta ) is varied, the maximum time taken by a ray to exit the plane ( mathrm{CD} ) is ( t times 10^{-9} mathrm{s} ), where ( mathrm{t} ) is [Speed of light ( c=3 x ) ( left.10^{8} mathrm{m} / mathrm{s}right] ) | 12 |

929 | A compound microscope has an objective lens of ( 1.0 mathrm{cm} ) focal length and an eye-piece of ( 2.5 mathrm{cm} ) of focal length. When the object is placed at ( 1.1 mathrm{cm} ) from the objective, the final image is at the least distance of direct vision. Thus, the magnification produced is A . 10 B. 11 ( c .100 ) D. 110 | 12 |

930 | What is the angle of the prism for which there will be no emergent ray from the prism if ( C ) is the critical angle ( ? ) A . 2 B. less than 2C c. more than 2 C D. None of these | 12 |

931 | A ray of light from denser medium strikes a rarer medium at angle of incidence ( i . ) The reflected and refracted rays make an angle of ( 90^{circ} ) with each other. The angle of reflection and refraction are ( r ) and ( r^{prime} . ) The critical angle is A ( cdot sin ^{-1}(tan r) ) B. ( sin ^{-1}(tan i) ) c. ( sin ^{-1}left(tan r^{prime}right) ) D. ( sin ^{-1}(tan (i+r)) ) | 12 |

932 | What happens when white light passes through a glass prism? A. Light dispersion and formation of a 7 colors spectrum. B. Light dispersion and formation of a 6 colors spectrum. c. Light reflection and a formation of a 6 colors spectrum. D. Light reflection and a formation of a 7 colors spectrum. | 12 |

933 | In spectrum obtained with prism which color is deviated maximum? A . Violet B. Redd c. Green D. orange | 12 |

934 | State whether the following statement is True or False. A shaving mirror is a concave mirror | 12 |

935 | The refracting angle of a prism is 2radians. Refractive indices of its material for violet and red are respectively 1.62 and ( 1.5 . ) Dispersion produced by it is A . 0.24 B. 0.06 c. 1.66 D. 1.12 | 12 |

936 | The diagram below shows two transparent materials-material G and material P. The black path is the path of a light ray through the materials. Which of the following statement is true? A. The sine of the angle that the light ray makes with the normal in substance G is greater than the sine of the angle that the light ray makes with the normal in substance P B. Light travels more slowly in material P than it does in material G C. Material G must be air of vacuum D. Material P must be air or a vacuum E. The index of refraction of substance ( P ) is less than the index of refraction of substance | 12 |

937 | A plane mirror is used as a magnifying glass. This statement is: A. True B. False | 12 |

938 | A ray ol IIght Is Incıdent normally orn orne face of a prism as shown in figure. The refractive index of the material of the 5 prism is ( frac{-a n d}{3} ) the prism is immersed in water of refractive index ( frac{x}{2} ) then 3 This question has multiple correct options A ( cdot ) The angle of emergence ( Theta_{2} ) of the ray is ( sin ^{-1}left(frac{5}{8}right) ) B. The angle of emergence ( Theta_{2} ) of the ray is ( sin ^{-1}left(frac{5}{4 sqrt{3}}right) ) C the angle of emergence ( Theta_{2} ) of the ray is ( sin ^{-1}left(frac{7}{3 sqrt{4}}right) ) D. Total internal reflection will not occur at P if the refractive index of water increases to a value greater ( operatorname{than} frac{5}{2 sqrt{3}} ) by dissolving some substance | 12 |

939 | Fill in the blanks to complete the following sentences: i) A ray travelling towards the mirror is the ii) Angle between reflected ray and normal is the iii) The angle between reflecting surface and the reflected ray is the A. i-incident ray, ii-angle of reflection, iii-glancing angle of reflection B. i-normal ray, ii-glancing angle of reflection, liii-angle of incidence C. i-reflected ray, ,ii glancing angle of incidence , iiiglancing angle of reflection D. i-reflected ray, ,ii-angle of incidence, iii- angle of reflection | 12 |

940 | Alternate inverted prisms are placed in series. Choose correct options. A. Even number of prisms does not produce a spectrum B. Odd number of prisms produce a spectrum c. More the number of prisms, less is the intensity of emergent ray/spectrum D. All of above | 12 |

941 | The distance between a convex lens and a plane mirror is ( 10 mathrm{cm} . ) The paralle rays incident on the convex lens, after reflection from the mirror, form image at the optical centre of the lens. Draw ray-diagram and find out the focal length of the lens. | 12 |

942 | For reading small letters with a lens A. one has to keep a convex lens at a distance between ( F ) and ( 2 mathrm{F} ) from the book. B. one has to keep a concave lens at a distance less than the focal length from the book C. one has to keep concave lens at a distance between and ( 2 mathrm{F} ) from the book D. One has to keep a convex lens at a distance less than the an focal length from the book E. None of these | 12 |

943 | The beautiful natural phenomenon of the rainbow is a combination of which of the following different phenomena? A. Refraction, reflection B. Dispersion, refraction c. Refraction, dispersion, reflection D. Reflection, dispersion | 12 |

944 | A linear object ( A B ) is placed along the axis of a concave mirror. The object is moving towards the mirror with speed ( U . ) The speed of the image of the point ( A ) is ( 4 U ) and the speed of the image of ( B ) is also ( 4 U ) but in opposite direction. If the center of the line ( A B ) is at a distance ( L ) from the mirror then find out the length of the object. A ( cdot frac{3 L}{2} ) в. ( frac{5 L}{2} ) ( c . L ) D. None of these | 12 |

945 | ( A ) film projector magnifies a ( 100 mathrm{cm}^{2} ) film strip on a screen. If the linear magnification is ( 4, ) the area of the magnified film on the screen is be ( 1000 mathrm{cm}^{2} ) A . True B. False | 12 |

946 | There is an equiconvex lens of focal length of ( 20 mathrm{cm} ). If the lens is cut into tow equal parts perpendicular to the optical axis, the focal length of each part will be A. ( 20 mathrm{cm} ) B. 10 ( mathrm{cm} ) c. ( 40 mathrm{cm} ) D. ( 15 mathrm{cm} ) | 12 |

947 | The phenomenon in which light that strikes a surface is thrown back into the same medium is called – A. reflection B. reflex action c. refraction D. regression | 12 |

948 | In our eyes, too much exposure to ultraviolet rays causes: A. cataracts B. muscular degeneration c. both A and B D. neither A nor B | 12 |

949 | A convex lens of focal length ( 20 mathrm{cm} ) is placed coaxially with a convex mirror of radius of curvature ( 20 mathrm{cm} . ) The two are kept at ( 15 mathrm{cm} ) apart from each other. ( mathrm{A} ) point object lies ( 60 mathrm{cm} ) in front of the convex lens. Draw a ray diagram to show the formation of the image by the combination. Determine the nature and position of the image formed. | 12 |

950 | If the light from a flashlight makes an angle of ( 30^{circ} ) with the mirror’s perpendicular, the angle of the reflected beam will be ( 120^{circ} ) A. True B. False | 12 |

951 | When light is refracted, which of the following does not change? A. Wavelength B. Frequency c. velocity D. Amplitude | 12 |

952 | In astronomical telescope, the final image is formed at: A. the least distance of distinct vision B. the focus of objective lens c. the focus of the eye lens D. beyond the focal length of eyepiece | 12 |

953 | Assertion Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Reason Blue has the shortest wavelength among all colours. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion c. Assertion is correct but Reason is incorrect D. Both Assertion and Reason are incorrect | 12 |

954 | A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If ( mu ) is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is: A ( cdot sin ^{-1}left(frac{1}{mu}right) ) B. ( tan ^{-1}left(frac{1}{mu}right) ) c. ( sin ^{-1}left(frac{mu-1}{mu}right) ) D ( cdot cos ^{-1}left(frac{1}{mu}right) ) | 12 |

955 | There is a small black dot at the centre ( C ) of a solid glass sphere of refractive index ( mu . ) When seen from outside, comment on the location of the dot. A. away from ( C ) for all values of ( mu ) B. at ( C ) for all values of ( mu ) ( mathbf{c} . ) at ( C ) for ( mu=1.5, ) but away from ( C ) for ( mu neq 1.5 ) D. at ( C ) only for ( sqrt{2} leq mu leq 1.5 ) | 12 |

956 | The split of white light into its constituent colours by a triangular prism is called A. Dispersion B. Reflection c. Refraction D. Scattering | 12 |

957 | How would you explain the coincidence of the experimental facts with the results obtained by a ray diagram in terms of behavior of images formed by lenses? | 12 |

958 | In the white light of sun, maximum scattering by the air molecules present in the earth’s atmosphere is for: A. red colour B. yellow colour c. green colour D. blue colour | 12 |

959 | An incident ray strike at a plane mirror at an angle of ( 15^{0} ) with the mirror. The angle between the reflected ray and incident ray is: | 12 |

960 | A linear object of height ( 10 mathrm{cm} ) is kept in front of a concave mirror of radius of curvature ( 15 mathrm{cm}, ) at a distance of ( 10 mathrm{cm} ) The image formed is A. Magnified and erect B. Magnified and inverted c. Diminished and erect D. Diminished and inverted | 12 |

961 | Which of the following is not a function of visual aid? A. It can magnify words B. Can provide suitable intensity of light c. can provide suitable material at proper distance D. All | 12 |

962 | The formula for the velocity of electromagnetic waves in vacuum is given by A. ( c=sqrt{mu_{0} varepsilon} ) B. ( c=frac{1}{sqrt{mu_{0} varepsilon_{0}}} ) c. ( _{c}=sqrt{frac{mu_{0}}{varepsilon_{0}}} ) D. ( c=sqrt{frac{varepsilon_{0}}{mu_{0}}} ) | 12 |

963 | Braille system has dot patterns. A . 62 B. 63 c. 72 D. 73 | 12 |

964 | Diamond is : A. transparent B. translucent c. opaque D. semi-absorbent | 12 |

965 | 4. A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface? (a) 60° (c) 45° (d) None of these (b) 75° | 12 |

966 | Fill in the blanks: Very fine particles mainly scatter light. | 12 |

967 | A hemispherical glass body of radius 10 ( c m ) and refractive index 1.5 is silvered on its curved surface. A small air bubble is ( 6 mathrm{cm} ) below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen: A. ( 14 mathrm{cm} ) below flat surface B. 20 ( c m ) below flat surface c. ( 16 mathrm{cm} ) below flat surface D. ( 30 mathrm{cm} ) below flat surface | 12 |

968 | Middle vascular coat that darkens the eye chamber and prevents refraction by absorbing the light rays is: A. Choroid B. Sclera c. Retina D. cornea | 12 |

969 | Distances measured below the principal axis are taken as A. Positive B. Negative c. None D. Both | 12 |

970 | Assertion: Different colours travel with different speed in vacuum. Reason: Wavelength of light depends on refractive index of medium. | 12 |

971 | What are the two most common defects of vision (or defect of eye)? How are they corrected? | 12 |

972 | A person has a ( 15 mathrm{cm} ) wide face and his two eyes are separated by ( 9 mathrm{cm} . ) The minimum width of a mirror required for the person to view his complete face literally is ( mathbf{A} cdot 15 mathrm{cm} ) в. 9 ст ( c .6 c m ) D. 3 cm | 12 |

973 | Find the odd one form the brackets and give reason behind your selection. [Blur, Yellow ,Red,Green] | 12 |

974 | Copy and complete the following ray ( operatorname{diagram} .left(i_{c}=42^{circ}right) ) | 12 |

975 | The image on the retina remains for : A . ( 20 s ) B. ( 10 s ) c. ( frac{1}{10} s ) D. ( frac{1}{16} ) | 12 |

976 | A converging lens of focal length ( f ) is used as simple microscope. If the least distance of distinct version of the observer is ( D ) and the lens is held close to the eye, the magnifying power of the lens is A. ( D / 2 f ) B. ( f / D ) c. ( frac{D}{f}-1 ) D. ( D / f ) | 12 |

977 | Our eyes function similar to a: A. Convex lens B. Concave lens c. cylindrical lens D. None of these | 12 |

978 | Fill in the blank: A boy blinks his right eye. Mirror image of the boy blinks its ( _{-}-_{-}-_{-}- ) eye A. both B. right c. none D. left | 12 |

979 | Object Convex Convex Image Pin ( quad ) Lens ( quad ) Mirror ( quad mathrm{P} ) 22.2 ( 32.2 mathrm{cm} ) ( 45.8 mathrm{cm} ) To find the focal length of a convex mirror, a student records the following data: The focal length of the convex lens is ( boldsymbol{f}_{1} ) | 12 |

980 | When an object is placed between optical centre and focus of lens: A. Inverted, real and enlarged image is formed B. Virtual, erect and enlarged image is formed c. Inverted, erect, diminished image is formed D. Virtual, real, diminished image is formed | 12 |

981 | What is refraction? A. Phenomenon in which ray of light deviates from its path at the surface of separation of two media. B. Phenomenon in which ray of light reflects from its path at the surface of separation of two media. C. Phenomenon in which ray of light deviates from its path at the surface of 1st media D. None | 12 |

982 | A ……. eye cannot distinctly see the objects that are too near. A. Myopic B. Presbyopic c. Hypermetropic D. Heterophoria | 12 |

983 | Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings. | 12 |

984 | A plane mirror forms image ( I ) of an object 0 kept ( 10 mathrm{cm} ) from the mirror. It is found that when a Plano concave thin lens is placed in front of and in contact with the mirror (plane surface of lens in contact with mirror), the position of image formed by plane mirror does not change. Then the refractive index of lens and radius of curvature of its curved surface are respectively: A. ( 1.5,10 mathrm{cm} ) B. ( 2.5,10 mathrm{cm} ) c. ( sqrt{2}, 10 mathrm{cm} ) D. All of these are possible | 12 |

985 | Which of the states Snell’s law? A. Incident ray, refracted ray and the normal at the point of incidence all lies in the same plane B. ( frac{sin i}{sin r}= ) constant (for a given media) C. Angle of incidence ( = ) Angle of refraction D. All | 12 |

986 | A ray of white light shows no dispersion on emerging from a glass plate (slab). Is there no dispersion inside the glass plate as well? | 12 |

987 | Brilliance of diamond is due to: A. shape B. cutting c. reflection D. total internal reflection | 12 |

988 | Due to refraction, when seen from outside, a coin placed under water in a bowl, appears to A. go down B. come up c. stay where it is D. move toward left | 12 |

989 | 56. An object 15 cm high is placed 10 cm from the optical center of a thin lens. Its image is formed 25 cm from the optical center on the same side of the lens as the object. The height of the image is (a) 2.5 cm (b) 0.2 cm |