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Wave Optics — NEET UG Physics PYQs

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

247 questionsPhysicsSolutions on every page
1

An unpolarized light beam of intensity I₀ passes through a series of n Polaroids P₁, P₂, P₃, P_n . The pass axis of each poloroid makes an angle of 60^ with the other poloroid. Wha

MHT CET Medical 2026 Solution View → 2

In a single-slit Fraunhofer diffraction experiment, the first secondary minimum is observed at an angle of 30^ for light of wavelength . If the same slit is now illuminated by ligh

MHT CET Medical 2026 Solution View → 3

In the Young's double slit experiment, the intensity of light at a point on the screen is 'K', being the wavelength of light used. The intensity at a point where path difference is

MHT CET Medical 2026 Solution View → 4

Two images are considered "just resolved" according to Rayleigh's criterion when

MHT CET Medical 2026 Solution View → 5

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths ₁ = 6000 Å and ₂ = 5000 Å one after the other. At what minimum distanc

MHT CET Medical 2026 Solution View → 6

In Young's double slit, 18 fringes are observed to be formed in a certain segment of the screen when light of wavelength 400 nm is used. If the wavelength is changed to 600 nm, the

MHT CET Medical 2026 Solution View → 7

When the un-polarised light beam is incident from air to glass (n = 1.5) at the Brewster's angle,

MHT CET Medical 2026 Solution View → 8

In Young's double-slit experiment, the intensity at a point is ( 1 4 ) of the maximum intensity. The angular position of this point is = wavelength of light used, d = separation be

MHT CET Medical 2026 Solution View → 9

In a diffraction pattern due to a single slit of width a, the first minimum is observed at an angle 30^ when light of wavelength 5000 Å is incident on the slit. The first secondary

MHT CET Medical 2026 Solution View → 10

Two coherent sources of intensity ratio interfere. In interference pattern, I_ max -I_ min I_ max +I_ min is

MHT CET Medical 2026 Solution View → 11

An interference is observed due to two coherent sources, A and B, separated by a distance 4 along the Y-axis, where is the wavelength of the source. A detector D is moved along the

MHT CET Medical 2026 Solution View → 12

Which of the following condition is TRUE for Fresnel diffraction? (i) Source of light and the obstacle (slit) are at large distance (infinite) from each other. (ii) Wavefront incid

MHT CET Medical 2026 Solution View → 13

Four polaroids are placed at an angle with the optic axis of the preceding one. If unpolarised light of intensity 'I' falls on the first polaroid, the intensity of light transmitte

MHT CET Medical 2026 Solution View → 14

Unpolarized light of intensity I₀ is made to pass through three polarizers P₁ , P₂ and P₃ successively. The polarization axis of P₂ makes an angle of 60^ with that of P₁ , while th

MHT CET Medical 2026 Solution View → 15

Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringewidths recorded are W_G , W_R and W_B respectively. Then

MHT CET Medical 2026 Solution View → 16

When light waves travel from rarer medium to denser medium, the qunatities which get changed are

MHT CET Medical 2026 Solution View → 17

The path difference between the two waves y₁ = a₁ ( t - 2 x + ) and y₂ = a₂ ( t - 2 x + ) is

MHT CET Medical 2026 Solution View → 18

For Young's double slit experiment, two statements are given below. Statement I: In the interference pattern, energy is not destroyed at the dark fringes; it is simply redistribute

MHT CET Medical 2026 Solution View → 19

A parallel beam of light of intensity I is incident on a glass plate. 25 % of light is reflected by upper surface and 50 % of light is reflected from lower surface. Rest of the lig

MHT CET Medical 2026 Solution View → 20

The Brewster's angle _B for air-glass interface should be such that (refractive index of glass = 3 2 )

MHT CET Medical 2026 Solution View → 21

In Young's double slit experiment, in an interference pattern, third minimum is observed exactly in front of one of the slits. If ' d ' is the distance between the slits and ' D '

MHT CET Medical 2026 Solution View → 22

The condition for observing Fraunhofer diffraction from a single slit is that the wavefront incident on a single slit must be

MHT CET Medical 2026 Solution View → 23

The equation of two interfering light waves are y₁ = b t and y₂ = b ( t + ) . If the light waves interfere destructively, then the possible value of are

MHT CET Medical 2026 Solution View → 24

In Young's double slit experiment using a monochromatic light of wavelength . The path difference (in terms of an integer n) corresponding to any point having one fourth of its pea

MHT CET Medical 2026 Solution View → 25

A ray of light from a monochromatic point source of light is incident at a point on the screen. If a thin mica film of thickeness 't' and refractive index 'n' is introduced in its

MHT CET Medical 2026 Solution View → 26

In a single slit diffraction pattern, identify the incorrect statement from the following

MHT CET Medical 2026 Solution View → 27

In Young's double slit experiment, the intensity on screen at a point, where path difference is ' /4 ', is ' K/4 '. The intensity at a point when path difference is ' ' will be [ (

MHT CET Medical 2026 Solution View → 28

A unpolarized beam of light having flux 10⁻² W falls normally on a rotating polarizer of cross-sectional area 3 10⁻⁴ m ^2 . If the energy of light passing through the polarizer per

MHT CET Medical 2026 Solution View → 29

In Young's double slit experiment, using monochromatic light of wavelength , the intensity of light at a point on the screen where the path difference is , is K units. The intensit

NEET 2026 Solution View → 30

In interference and diffraction, the light energy is redistributed. If it reduces in one region, producing a dark fringe, it increases in another region, producing a bright fringe.

NEET 2026 Solution View → 31

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then -

NEET 2025 Solution View → 32

The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at 22.5^ from the polarization axis of one of the polaroid, is ( I ₀ is the intensity

NEET 2025 Solution View → 33

A beam of unpolarized light of intensity I₀ is passed through a polaroid A , then through another polaroid B , oriented at 60^ and finally through another polaroid C , oriented at

NEET 2024 Solution View → 34

Interference pattern can be observed due to superposition of the following waves: A. y=a t B. y=a 2 t C. y=a ( t- ) D. y=a 3 t Choose the correct answer from the options given belo

NEET 2024 Solution View → 35

An unpolarised light beam strikes a glass surface at Brewster's angle. Then

NEET 2024 Solution View → 36

Two slits in Young's double slit experiment are 1.5 mm apart and the screen is placed at a distance of 1 m from the slits. If the wavelength of light used is 600 10⁻⁹ ~m then the f

NEET 2024 Solution View → 37

If the monochromatic source in Young's double slit experiment is replaced by white light, then

NEET 2024 Solution View → 38

For Young's double slit experiment, two statements are given below: Statement I : If screen is moved away from the plane of slits, angular separation of the fringes remains con

NEET 2023 Solution View → 39

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600   nm wavelength is used. If the waveleng

NEET 2022 Solution View → 40

If the screen is moved away from the plane of the slits in a Young's double slit experiment, then the:

NEET 2022 Solution View → 41

After passing through a polariser a linearly polarised light of intensity I is incident on an analyser making an angle of 30^ with that of the polariser. The intensity of light emi

NEET 2022 Solution View → 42

The Brewsters angle i b for an interface should be

NEET 2020 Solution View → 43

Two coherent sources of light interfere and produce fringe patterns on a screen. For central maximum, the phase difference between the two waves will be

NEET 2020 Solution View → 44

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe w

NEET 2020 Solution View → 45

Huygen's principle does not use

JIPMER 2019 Solution View → 46

In YDSE angular fringe width is 0.1^ wavelength of light used is 6000 Å . Find the distance between two slits.

JIPMER 2019 Solution View → 47

In a double slit experiment, when light of wavelength 400   n m was used, the angular width of the first minima formed on a screen placed 1   m away was found to be 0.2 &

NEET 2019 Solution View → 48

In a Young's double slit experiment, if there is no initial phase-difference between the light from the two slits, a point on the screen corresponding to the fifth minimum has path

NEET 2019 Solution View → 49

Angular width of the central maxima in the Fraunhoffer diffraction for =6000 Å is ₀ . When the same slit is illuminated by another monochromatic light, the angular width decreases

NEET 2019 Solution View → 50

In a Young's double slit experiment, a light of wavelength 500 ~nm falls on it. Its slits separation is 2 ~mm and distance between plane of slits and screen is 2 ~m then, find dist

NEET 2019 Solution View → 51

Assertion : Diffraction is common in sound but not common in light waves. Reason : Wavelength of light is more than the wavelength of sound.

NEET 2019 Solution View → 52

The distance between the first dark and bright fringes formed in Young's double slit experiment with band width B is

NEET 2019 Solution View → 53

Light of wavelength 6000 Å falls on a single slit of width 0.1 ~mm . The second minima will be formed for the angle of diffraction of

NEET 2019 Solution View → 54

Two slits are separated by a distance of 0.5 mm and illuminated with light of =6000 Å . If the screen is placed 2.5 m , from the slits. The distance of the third bright image from

JIPMER 2018 Solution View → 55

Unpolarised light is incident from air on plane surface of a material of refractive index μ . At a particular angle of incident i it is found that the reflected and refracted

NEET 2018 Solution View → 56

In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896   Å and distance D between the screen a

NEET 2018 Solution View → 57

The head lights of a jeep are 1.2 ~m apart. If the pupil of the eye of an observer has a diameter of 2 ~mm and light of wavelength 5896 Å is used, what should be the maximum distan

NEET 2018 Solution View → 58

Assertion : Colours are seen in thin layers of oil on the surface of water. Reason : White light is composed of several colours.

NEET 2018 Solution View → 59

In a single slit diffraction the distance between plane of slit and screen is 1 ~m . The size of the slit is 0.7 ~mm and second maximum is formed at the distance of 2 ~mm from the

NEET 2018 Solution View → 60

Light is incident on a polarizer with intensity I₀ . A second prism called analyzer is kept at a angle of 15^ , from the first polarizer then the intensity of final emergent light

NEET 2018 Solution View → 61

Assertion : In Young's double slit experiment, interference pattern disappears when one of the slits is closed. Reason : Interference occurs due to superposition of light waves fro

NEET 2018 Solution View → 62

A source emits electromagnetic waves of wavelength 3 m . One beam reaches the observer directly and other after reflection from a water surface, travelling 1.5 m extra distance and

JIPMER 2017 Solution View → 63

White light is used to illuminate two slits in Young's double slit experiment. The separation between the slits is b and the screen is at a distance d( b) from the slits. At a poin

JIPMER 2017 Solution View → 64

The maximum numbers of possible interference maxima for slit separation equal to twice the wavelength in Young's double slit experiment is

JIPMER 2017 Solution View → 65

Two Polaroids P 1 and P 2 are placed with their axis perpendicular to each other. Unpolarised light with intensity I 0   is incident on P 1 . A third polaroid P 3 is kept in b

NEET 2017 Solution View → 66

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8 t h bright fringe in the medium lies where 5 t h dark fringe li

NEET 2017 Solution View → 67

Two slits are separated by a distance of 0.5 mmand illuminated withlight of wavelength =6000 Å . If the screen is placed at 2.5 ~m from the slits. The distance of the third bright

NEET 2017 Solution View → 68

Assertion : Two point coherent sources of light S₁ and S₂ are placed on a line as shown. P and Q are two points on that line. If at point P maximum intensity is observed then maxim

NEET 2017 Solution View → 69

Angular width of central maximum in the Fraunhoffer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 Å . When the slit is illuminated

JIPMER 2016 Solution View → 70

The intensity of each of the two slits in Young's double slit experiment is I₀ . Calculate the minimum separation between the points on the screen, where intensities are 2 I₀ and I

JIPMER 2016 Solution View → 71

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 × 1

NEET 2016 Solution View → 72

The interference pattern is obtained with two coherent light sources of intensity ratio, n . In the interference pattern, the ratio, I max − I min I max + I min will be

NEET 2016 Solution View → 73

The intensity at the maximum in a Young's double slit experiment is I 0 . Distance between two slits is d = 5 λ , where λ is the wavelength of light used in the exper

NEET 2016 Solution View → 74

In a diffraction pattern due to a single slit of width a the first minimum is observed at an angle 30 o when light of wavelength 5000   Å is incident on the slit. The fi

NEET 2016 Solution View → 75

In a Fraunhofer diffraction at single slit of width d with incident light of wavelength 5500 Å , the first minimum is observed, at angle 30^ . The first secondary maximum is observ

NEET 2016 Solution View → 76

The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is 9: 1 . The intensities of the used light sources are in ratio

NEET 2016 Solution View → 77

The two coherent sources with intensity ratio produce interference. The fringe visibility will be

NEET 2016 Solution View → 78

Assertion : In YDSE bright and dark fringe are equally spaced. Reason : It only depends upon phase difference.

NEET 2016 Solution View → 79

At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the w

NEET 2015 Solution View → 80

Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, I m a x I m i n is:

NEET 2015 Solution View → 81

In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit

NEET 2015 Solution View → 82

For a parallel beam of monochromatic light of wavelength λ , diffraction is produced by a single slit whose width a is of the order of the wavelength of the light. If D is the

NEET 2015 Solution View → 83

In a certain double slit experimental arrangement, interference fringes of width 1 ~mm each are observed when light of wavelength 5000 Å is used. Keeping the setup unaltered, if th

NEET 2015 Solution View → 84

If prism angle =1^ , =1.54 , distance between screen and prism (D)=0.7 ~m , distance between prism and source a=0.3 ~m , =180 nm , then in Fresnal biprism find the value of (fringe

JIPMER 2014 Solution View → 85

If the sun rays are incidenting at 60^ angle and intensity is I . If the sun rays are made incident at 30^ angle, then what will be the intensity?

JIPMER 2014 Solution View → 86

A beam of light of λ = 600   n m from a distant source falls on a single slit 1   m m wide and the resulting diffraction pattern is observed on a screen 2   m a

NEET 2014 Solution View → 87

In the Young’s double slit experiment the intensity of light at a point on the screen where the path difference is λ is K , ( λ being the wave length of light used)

NEET 2014 Solution View → 88

In a Young's double slit experiment the intensity of light when slit is at distance from central is I. What will be the intensity at the distance of slit is 6 ?

NEET 2014 Solution View → 89

Light travels faster in air than that in glass. This is accordance with

JIPMER 2013 Solution View → 90

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is i

NEET 2013 Solution View → 91

In Young's double slit experiment the distance between the slits and the screen is doubled. The separation between the slits reduced to half. As a result the fringe width:

NEET 2013 Solution View → 92

A parallel beam of light of wavelength is incident normally on a narrow slit. A diffraction pattern formed on a screen placed perpendicular to the direction of the incident beam. A

NEET 2013 Solution View → 93

In Young's double slit experiment, the slits are 2 ~mm apart and are illuminated by photons of two wavelengths ₁=12000 Å and ₂=10000 Å . At what minimum distance from the common ce

NEET 2013 Solution View → 94

Polaroid glass is used in sun glasses because

NEET 2013 Solution View → 95

In a Young's double slit experiment the spacing between the slits is 0.3 ~mm and the screen is kept at a distance of 1.5 ~m . The second bright fringe is found 6 ~mm from the centr

NEET 2013 Solution View → 96

Assertion : When light ray is incident at polarising angle on glass, refracted light is partially polarised. Reason : The intensity of light decreases in polarisation.

NEET 2013 Solution View → 97

In Young's double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is

JIPMER 2012 Solution View → 98

Two sinusoidal waves of intensity I having same frequency and same amplitude interferes constructively at a point. The resultant intensity at a point will be

NEET 2012 Solution View → 99

In Young's double slit experiment, fringe order is represented by m , then fringe width is

NEET 2012 Solution View → 100

A light ray is incident on a glass slab, it is partially reflected and partially transmitted. Then the reflected ray is

NEET 2012 Solution View → 101

In Young's double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is

JIPMER 2011 Solution View → 102

In an interference, the intensity of two interfering waves are I and 4 I respectively. They produce intensity at two points A and B with phase angle of / 2 and respectively. Then d

NEET 2011 Solution View → 103

In a single slit diffraction with =500 ~nm and a lens of diameter 0.1 ~mm then width of central maxima, obtain on screen at a distance of 1 ~m will be

NEET 2011 Solution View → 104

If Young's double slit experiment is performed in water instead of air, then

JIPMER 2010 Solution View → 105

Two coherent light beams of intensities I and 4 I are superposed. The maximum and minimum possible intensities in the resulting beam are

JIPMER 2010 Solution View → 106

A lens having focal length f and aperture of diameter d forms an image of intensity I . Aperture of diameter d 2 in central region of lens is covered by a black paper. Focal length

NEET 2010 Solution View → 107

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double-slit experiment, is

JIPMER 2009 Solution View → 108

Which out of following, cannot produce two coherent sources?

NEET 2009 Solution View → 109

In Young's double slit experiment, the two slits act as coherent sources of equal amplitude a and of wavelength . In another experiment with the same set up, the two slits are sour

NEET 2009 Solution View → 110

Interference was observed in an interference chamber when air was present. Now, the chamber is evacuated and if the same light is used, a careful observation will show

JIPMER 2008 Solution View → 111

In Young's double slit experiment, the distance between two slits is made three times then the fringe width will become

NEET 2008 Solution View → 112

Light is incident normally on a diffraction grating through which the first diffraction is seen at (32^ ). In this case the second order diffraction will be

NEET 2008 Solution View → 113

A point source is kept at a distance of (1000 ~m ) has an illumination (I ). To change the illumination to (16 I ) the new distance should become

NEET 2007 Solution View → 114

Assertion : A white source of light during interference forms only white and black fringes. Reason : Width of fringe is inversely proportional to the wavelength of the light used.

NEET 2007 Solution View → 115

Which of the following diagrams represents the variation of electric field vector with time for a circularly polarized light?

NEET 2006 Solution View → 116

When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of

NEET 2005 Solution View → 117

In case of linearly polarised light, the magnitude of the electric field vector

NEET 2005 Solution View → 118

Assertion : The clouds in sky generally appear to be whitish. Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths.

NEET 2005 Solution View → 119

Sodium lamps are used in foggy conditions because

NEET 2004 Solution View → 120

A monochromatic beam of light is used for the formation of fringes on the screen by illuminating the two slits in the Young's double slit interference experiment. When a thin film

NEET 2004 Solution View →
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