NEET Wave Optics PYQ practice sheet

8 previous-year NEET Physics questions from Wave Optics, newest papers first. Wave Optics carries 10 of the Physics questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   NEET 2026

   In Young's double slit experiment, using monochromatic light of wavelength $\lambda$, the intensity of light at a point on the screen where the path difference is $\lambda$, is $K$ units. The intensity of light at a point where the path difference is $\dfrac{\lambda}{3}$ will be

   • (A)
     $2K$
   • (B)
     $K$
   • (C)
     $\dfrac{K}{2}$
   • (D)
     $\dfrac{K}{4}$
2. 2.

   NEET 2026

   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. A. As there is no gain or loss of energy, these phenomena are consistent with the principle of conservation of energy. B. Diffraction and interference are characteristics exhibited only by light waves. Choose the correct answer from the options given below:

   • (A)
     A is true and B is also true
   • (B)
     A is true, but B is false
   • (C)
     A is false, but B is true
   • (D)
     Both A and B are false
3. 3.

   NEET 2024

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

   • (A)
     the reflected light will be completely polarised but the refracted light will be partially polarised.
   • (B)
     both the reflected and refracted light will be completely polarised.
   • (C)
     the refracted light will be completely polarised.
   • (D)
     the reflected light will be partially polarised.
4. 4.

   NEET 2024

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

   • (A)
     all bright fringes will be of equal width.
   • (B)
     there will be a central bright white fringe surrounded by a few coloured fringes.
   • (C)
     interference pattern will disappear.
   • (D)
     there will be a central dark fringe surrounded by a few coloured fringes.
5. 5.

   NEET 2023

   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:

   • (A)
     Statement I is false but Statement II is true.
   • (B)
     Both Statement I and Statement II are true.
   • (C)
     Both Statement I and Statement II are false.
   • (D)
     Statement I is true but Statement II is false.
6. 6.

   NEET 2022

   In a Young's double slit experiment, a student observes 8 fringes in a certain segment of the 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:

   • (A)
     12
   • (B)
     6
   • (C)
     8
   • (D)
     9
7. 7.

   NEET 2020

   The Brewsters angle $i_b$ for an interface should be :

   • (A)
     $0^\circ < i_b < 30^\circ$
   • (B)
     $30^\circ < i_b < 45^\circ$
   • (C)
     $45^\circ < i_b < 90^\circ$
   • (D)
     $i_b = 90^\circ$
8. 8.

   NEET 2020

   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 :

   • (A)
     double
   • (B)
     half
   • (C)
     four times
   • (D)
     one-fourth