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Practice Questions
MCQ (Single Correct Answer)
1
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from the polarization axis of one of the polaroids, is ( $I 0_0$ is the intensity of polarised light after passing through the first polaroid):
NEET 2025
2

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

NEET 2025
3

Two slits in Young's double slit experiment are $$1.5 \mathrm{~mm}$$ apart and the screen is placed at a distance of $$1 \mathrm{~m}$$ from the slits. If the wavelength of light used is $$600 \times 10^{-9} \mathrm{~m}$$ then the fringe separation is

NEET 2024 (Re-Examination)
4

Interference pattern can be observed due to superposition of the following waves:

A. $$y=a \sin \omega t$$

B. $$y=a \sin 2 \omega t$$

C. $$y=a \sin (\omega t-\phi)$$

D. $$y=a \sin 3 \omega t$$

Choose the correct answer from the options given below.

NEET 2024 (Re-Examination)
5

A beam of unpolarized light of intensity I0 is passed through a polaroid A, then through another polaroid B, oriented at $$60^\circ$$ and finally through another polaroid C, oriented at 45$$^\circ$$ relative to B as shown. The intensity of emergent light is:

NEET 2024 (Re-Examination) Physics - Wave Optics Question 3 English

NEET 2024 (Re-Examination)
6

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

NEET 2024
7

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

NEET 2024
8

NEET 2023 Manipur Physics - Wave Optics Question 8 English

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

NEET 2023 Manipur
9

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 constant.

Statement II : If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

In the light of the above statements, choose the correct answer from the options given below :

NEET 2023
10

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

NEET 2022 Phase 2
11

After passing through a polariser a linearly polarised light of intensity I is incident on an analyser making an angle of 30$$^\circ$$ with that of the polariser. The intensity of light emitted from the analyser will be

NEET 2022 Phase 2
12

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 wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is

NEET 2022 Phase 1
13
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 :
NEET 2020 Phase 1
14
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 width becomes :
NEET 2020 Phase 1
15
In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2o. What will be the angular width of the first minima, ($$\mu $$water = 4/3) if the entire experimental apparatus is immersed in water?
NEET 2019
16
In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength $$\lambda $$ of the light used is 5896 $$\mathop A\limits^0 $$ and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20o. To increase the fringe angular width to 0.21o (with same $$\lambda $$ and D) the separation between the slits needs to be changed to
NEET 2018
17
Unpolarised light is incident from air on a plane surface of a material of refractive index $$\mu $$. At a particular angle of incidence i, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
NEET 2018
18
Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly
NEET 2017
19
The ratio of resolving powers of an optical microscope for two wavelength $$\lambda $$1 = 4000 $$\mathop A\limits^ \circ $$ and $${\lambda _2}$$ = 6000 $$\mathop A\limits^ \circ $$ is
NEET 2017
20
Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light $$I$$0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45o with that of P1. The intensity of transmitted light through P2 is
NEET 2017
21
The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio $${{{I_{max}} - {I_{\min }}} \over {{I_{max}} + {I_{min}}}}$$ will be
NEET 2016 Phase 2
22
A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aparture is illuminated normally by a parallel beam of wavelength 5 $$ \times $$ 10$$-$$5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is
NEET 2016 Phase 2
23
In a diffraction pattern due to a single slit of width $$a$$, the first minimum is observed at an angle 30o when light of wavelength 5000 $$\mathop A\limits^ \circ $$ is incident on the slit. The first secondary maximum is observed at an angle of
NEET 2016 Phase 1
24
The intensity at the maximum in a Young's double slit experiment is $$I$$0. Distance between two slits is d = 5$$\lambda $$, where $$\lambda $$ is the wavelength of light used in the expreriment. What will be the intensity in front of one of the slits on the screen placed at a distance D = 10d ?
NEET 2016 Phase 1
25
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 wavelet from the midpoint of the slit is
AIPMT 2015
26
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, $${{{I_{max}}} \over {{I_{min}}}}$$ is
AIPMT 2015
27
For a parallel beam of monochromatic light of wavelength '$$\lambda $$' , diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the wifth of the central maxima will be
AIPMT 2015 Cancelled Paper
28
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 for obtaining ten maxima of double slit within the central maxima of single slit pattern ?
AIPMT 2015 Cancelled Paper
29
A beam of light of $$\lambda = 600$$ nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is
AIPMT 2014
30
In the Young's double slit experiment, the intensity of light at a point on the screen where the path difference $$\lambda $$ is K, ($$\lambda $$ being the wavelength of light used). The intensity at a point where the path difference is $$\lambda $$/4 will be
AIPMT 2014
31
In Young's double slit experiment the distance between the slits and the screen is doubled. The separation between the slits is reduced to half. As a result the fringe width
NEET 2013 (Karnataka)
32
A parallel beam of light of wavelength $$\lambda $$ is incident normally on a narrow slit. A diffraction pattern formed on a screen placed perpenficular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is
NEET 2013 (Karnataka)
33
The reddish appearance of the sun at sunrise and sunset is due to
NEET 2013 (Karnataka)
34
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths $${\lambda _1}$$ = 12000 $$\mathop A\limits^ \circ $$ and $${\lambda _2}$$ = 10000 $$\mathop A\limits^ \circ $$. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?
NEET 2013
35
The frequency of a light wave in a material is 2 $$ \times $$ 1014 Hz and wavelength is 5000 $$\mathop A\limits^ \circ $$. The refractive index of material will be
AIPMT 2007
36
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 $$\mathop A\limits^ \circ $$ is of the order of
AIPMT 2005
37
A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometer from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 $$\mathop A\limits^ \circ $$, is of the order of
AIPMT 2004
38
A ray of light travelling in air have wavelength $$\lambda $$, frequency n, velocity v and intensity $$I$$. If this ray enters into water then these parameters are $$\lambda $$', n', v' and $$I$$' respectively. Which relation is correct from following ?
AIPMT 2001