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Ray Optics — NEET UG Physics PYQs

497 previous year questions from Ray Optics with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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1

A container is filled with water ( = 4/3 ) up to a height of 24 cm. A concave mirror is placed 10 cm above the water level, and the image (I) of an object placed at the bottom is f

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2

The refracting angle of a prism is 'A' and its refractive index is ( A 2 ) . The minimum deviation produced by the prism is

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3

A circular beam of light having diameter 'd' falls on a plane liquid surface from air. The angle of incidence is 45^ and refractive index of liquid is 'n'. The diameter of the refr

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4

What is the total optical path length of two media in contact with thicknesses of d and d 4 and refractive indices of n₁ and n₂ , respectively?

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5

A beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different points on the principle axis after ref

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6

The angle of minimum deviation produced by a thin prism in air is ₁ . What will be the minimum deviation ( ₂) if the prism is immersed in another liquid medium? _a n_g = 3/2, _a n_

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7

A ray of light passes through four transparent media with refractive indices ₁ , ₂ , ₃ and ₄ as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD

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8

The thin prism having refracting angle 10^ is made of glass of refractive index 1.42 . This prism is combined with another thin prism of glass of refractive index 1.7 . This combin

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9

A convex lens of refractive index has two surfaces of equal radius of curvature R . The focal length of convex lens is

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10

A convex lens of focal length 'f' produces a real image whose size is 'm' times the size of an object. The distance of the image from the lens, 'v', is given by

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11

A ray of light travels from a denser medium to a rarer medium. The reflected and the refracted rays are perpendicular to each other. If r and r' are angles of reflection and refrac

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12

In an experiment to measure the power of a convex lens, the least count of measuring scale for the position of object u and the position of image v are u and v respectively. The er

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13

Three beams of blue, green and orange colour are made to pass separately through a prism . In the position of minimum deviation, the angle of refraction will be (the angle of prism

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14

An object is placed 15 cm from a concave mirror of focal length 10 cm, then the nature of the image formed will be

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15

The focal length of the objective of astronomical telescope is 2 m . Under normal adjustment, length of telescope is 2.10 m . The magnifying power of the telescope under normal adj

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16

The Brewster's angle for the air-glass interface is (54.74)^ . If a ray of light going from air to glass stikes at an angle of incidence 45^0 , then the angle of refraction is ( (5

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17

Light enters from air into water of refractive index 4 3 . The percentage change in its wavelength is

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18

A ray of monochromatic light is passing through an equilateral prism (ABC) as shown in the figure. The refracted ray (QR) is parallel to its base (BC) and the angle of incidence (

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19

The lens combination as shown in the figure, consists of two lenses, L₁ and L₂ , of the focal lengths +10 cm and -10 cm, respectively. The position of the image formed is :

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20

In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens, after refraction :

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21

Consider three media P , Q and R with refractive indices 1 , 1.25 , and 1.5 , respectively. The medium Q having a thickness of 5 cm is placed between extended media P and R as show

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22

In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison t

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23

A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the distance of distinct vision of eye is 25 cm , the magnifica

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24

A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm . The magnifying power of telescope for viewing a distant object is:

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25

A light ray enters through a right angled prism at point P with the angle of incidence 30^ as shown in figure. It travels through the prism parallel to its base B C and emerges alo

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26

Given below are two statements: Statement I : Image formation needs regular reflection and/or refraction. Statement II : The variety in colour of objects we see around us is due to

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27

₀ and ₀ are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are 2 ₀ and 1.5 ₀ respectively, the refracti

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28

Which set of colours will come out in air for a situation shown in figure?

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29

Light travels a distance   x   in time   t 1 in air and 10 x in time t 2 in another denser medium. What is the critical angle for this medium?

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30

An object is mounted on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens placed between these walls. The lens is kept at distance

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31

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?

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32

A lens is made up of 3 different transparent media as shown in figure. A point object O is placed on its axis beyond 2 f . How many real images will be obtained on the other side?

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33

A horizontal ray of light is incident on the right-angled prism with prism angle 6^ . If the refractive index of the material of the prism is 1.5 , then the angle of emergence will

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34

Two thin lenses are of same focal lengths f , but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the co

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35

During a cloudy day, a primary and a secondary rainbow may be created, then the:

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36

An astronomical refracting telescope is being used by an observer to observe planets in normal adjustment. The focal lengths of the objective and eye piece used in the construction

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37

A biconvex lens has radii of curvature 20   cm each. If the refractive index of the material of the lens is 1 . 5 , the power of the lens is:

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38

Two transparent media A and B are separated by a plane boundary. The speed of light in those media are 1 . 5 × 10 8   m   s - 1 and 2 . 0 × 10 8   m  

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39

A light ray falls on a glass surface of refractive index 3 , at an angle 60 ° . The angle between the refracted and reflected rays would be:

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40

A convex lens A of focal length 20   cm and a concave lens B of focal length 5   cm are kept along the same axis with a distance d between them. If a parallel beam of lig

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41

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

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42

Find the value of the angle of emergence from the prism. Refractive index of the glass is 3 .

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43

A point object is placed at a distance of 60   cm from a convex lens of focal length 30   cm . If a plane mirror were put perpendicular to the principal axis of the lens

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44

An object is placed on the principal axis of a concave mirror at a distance of 1 . 5 f ( f is the focal length). The image will be at,

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45

If the critical angle for total internal reflection from a medium to vacuum is 45 ° , then velocity of light in the medium is,

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46

The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10   cm . Then the refractive index of the material of the lens is,

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47

Assume that light of wavelength 600   nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2   m is:

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48

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A ) and emerges normally from the opposite surface. If the refractive index

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49

The refractive index of the material of an equilateral prism is 1.6. The angle of minimum deviation due to the prism would be

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50

A spherical mirror forms an image of magnification 3. The object distance, if focal length of mirror is 24 ~cm , may be

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51

A bi-convex lens is formed with two thin 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 the curved

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52

Assertion : A double convex lens ( =1.5) has focal length 10 ~cm . When the lens is immersed in water ( =4 / 3) , its focal length becomes 40 ~cm . Reason : 1 f = ( _g- _a _a ) ( 1

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53

A telescope, whose objective lens has an aperture of 1 ~mm for the wavelength of light 500 Å , then limiting resolving power of the telescope is

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54

A fish in water (refractive index n ) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance

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55

A person wear normal spectacles in which the distance between glasses and eyes is approximately 2 ~cm , then power required is -5 D. If he wears contact lens, then the required pow

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56

Find the value of in the given diagram.

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57

Find the position of final image from first lens. Given focal length of each lens is 10 cm .

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58

When a light ray enters from oil to glass on oil- glass interface, then velocity of light changes by a factor of [given, _ oil =2, _ glass =3 / 2 ]

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59

If velocity of light in air is c, what will be the velocity of light in a medium of refractive index 1.4 ?

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60

An equi-convex lens has power P it is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be

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61

Two similar thin equi-convex lenses of focal length f each are kept coaxially in contact with each other, such that the focal length of the combination is F 1 . When the space betw

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62

In total internal reflection, when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

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63

Pick the wrong answer in the context with rainbow.

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64

A double convex lens has focal length 25 ~cm . The radius of curvature of one of the surfaces is doubled of the other. Find the radii, if the refractive index of the material of th

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65

In the figure, a ray of light is perpendicular to the face A B of a glass prism ( =1.52) . Find the value of so that the ray is totally reflected at face A C , if the prism is imme

AIIMS 2018 Solution
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66

In a simple microscope of focal length 5 ~cm , final image is formed at the least distance of distinct vision, then its magnification will be

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67

Focal length of convex lens is 100 ~cm and focal length of concave lens is 8 ~cm . Find the magnification of the given combination of lens if object is placed at point O .

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68

If focal length of human eye is 2 ~cm , then find the focal length of contact lens, such that a combined focus system of focal length 2.5 ~cm is obtained after using contact lens.

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69

If minimum deviation =30^ , then speed of light in shown prism will be

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70

The refractive index of glass is 1.5 . The speed of light in glass is

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71

A prism of crown glass with refracting angle of 5^ and mean refractive index =1.51 is combined with a flint glass prism of refractive index =1.65 to produce no deviation. Find the

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72

Calculate the dispersive power for crown glass from the given data array rll & _ V =1.523 and & _ R =1.5145 array

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73

The refractive index of the materiel of a prism is 2 and the angle of the prism is 30 o . One of the two refracting surface of the prism is made a mirror inwards, by silver coating

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74

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

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75

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement

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76

The least distance of vision of a longsighted person is 60 ~cm . By using a spectacle lens, this distance is reduced to 12 ~cm . The power of the lens is

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77

A 2.0 ~cm tall object is placed 15 ~cm in front of a concave mirror of focal length 10 ~cm . What is the size and nature of the image?

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78

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 lig

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79

A thin symmetrical double convex lens of refractive index ₂=1.5 is placed between a medium of refractive index ₁=1.4 to the left and another medium of refractive index ₃=1 6 to the

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80

An isotropic point source of light is suspended h metre vertically above the centre of circular table of radius r metre. Then, the ratio of illumenances at the centre to that at th

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81

The plane face of a plano convex lens is silvered. If be the refractive index and R , the radius of curvature of curved surface, then system will behave like a concave mirror of cu

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82

A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and

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83

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just ab

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84

A thin prism having refracting angle 10 o is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This comb

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85

The ratio of resolving powers of an optical microscope for two wavelengths λ 1 = 4000   Å and λ 2 = 6000  Å is

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86

Light wave enters from medium 1 to medium 2. Its velocity in 2^ nd medium is double from 1^ st . For total internal reflection the angle of incidence must be greater than

AIIMS 2016 Solution
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87

For a situation shown in figure, find the refrective index of glass so that it will suffer total internal reflection at the vertical surface.

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88

Assertion : Electron microscope has more resolving power than optical microscope. Reason : We can control the energy of electron.

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89

A transparent cube of 15 ~cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 ~cm and when viewed through opposite face is 4 ~cm . The refract

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90

Assertion : When an object is placed between two plane parallel mirrors, then all the images found are of equal intensity. Reason : In case of plane parallel mirrors, only two imag

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91

Focal length of objective and eye piece of telescope are 200 ~cm and 4 ~cm respectively. What is the length of telescope for normal adjustment?

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92

A fish rising vertically to the surface of water in a lake uniformly at the rate of 2 ~m / s observes a kingfisher diving vertically towards the water at a rate of 10 ~m / s . If r

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93

A quarter cylinder of radius R and refractive index 1.5 is placed on a table. A point object P is kept at a distance of m R from it as shown in figure. For what value of m for whic

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94

A square wire of side 2.0 cm is placed 20 cm in front of a concave mirror of focal length 10 cm with its centre on the axis of the mirror and its plane normal to the axis. The area

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95

A prism of a certain angle deviates the red and blue rays by 8 and 12 , respectively. Another prism of the same angle deviates the red and blue rays by 10 and 14 , respectively. Th

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96

The magnification produced by a astronomical telescope for normal adjustment is 10 and the length of the telescope is 1.1 m . The magnification, when the image is formed atleast di

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97

Two identical glass μ g = 3 2 equiconvex lenses of focal length, f are kept in contact. The space between the two lenses is filled with water μ w = 4 3 . The focal length

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98

An air bubble in a glass slab with refractive index 1 . 5 (near-normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The th

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99

A person can see clearly object only when they lie between 50 cm to 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and pow

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100

A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by

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101

Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror] Column 1 Column 2 (A) m = - 2 (a) Convex mirror (B) m = - 1 2 (b) C

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102

The angle of incidence for a ray of light at a refracting surface of a prism is 45 o . The angle of prism is 60 o . If the ray suffers minimum deviation through the prism, the angl

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103

A person uses +1.5 D glasses to have normal vision from 25 ~cm onwards. He uses a +20 D lens as a simple microscope to see an object. What is the maximum magnifying power if he use

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104

Assertion : In optical fibre, the diameter of the core is kept small. Reason : The smaller diameter of the core ensures that the fibres should have incident angle more than the cri

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105

Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more. Reason : Objective lens of large diameter collects more light.

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106

Assertion : The frequencies of incident, reflected and refracted beam of monochromatic light passing from one medium to another are the same. Reason : The incident, the reflected a

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107

Assertion: A secondary rainbow have inverted colours than the primary rainbow. Reason : The secondary rainbow is formed by single total internal reflection.

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108

A vessel of depth t is half filled with a liquid having refractive index n₁ and the other half is filled with water of having refractive index n₂ . The apparent depth of the vessel

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109

A beam of light consisting of red, green and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the above red, green and blue w

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110

In an astronomical telescope in normal adjustment a straight black line of the length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. Th

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111

Two identical thin Plano-convex glass lenses (refractive index 1 .5 ) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the center.

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112

The refracting angle of a prism is A , and refractive index of the material of the prism is cot A 2 . The angle of minimum deviation is

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113

The length of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is 1.5. Then the angle of prism is

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114

Assertion: The edges of the images of white object formed by a concave mirror on the screen appear white. Reason: Concave mirror does not suffer from chromatic aberration.

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115

Resolving power of reflecting microscope increases with

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116

The near point of distinct vision is at 1 ~m for an elderly person. What power of lens is to be used to bring the near point to the minimum distance of distinct vision (25 ~cm ) ?

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117

To get three images of a single object, we should have two plane mirrors at an angle of

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118

It the focal length of objective lens is increased then magnifying power of:

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119

The angle of a prism is ‘ A ’. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2 A on the first surface returns back through the

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120

The frequency of a light wave in a material is 2 10¹⁴ ~Hz and wavelength is 5000 Å . The refractive index of material will be

AIIMS 2013 Solution
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