Wave Optics Class 12 MCQs Questions with Answers

1. For sustained interference, we need two sources which
emit radiations :

2. What happens if one of the slits, say S1 in Young’s double slit experiment is  covered with a glass plate which absorbs half the intensity of light from it?

3. In a Young’s double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:

4.  In Young’s double slit experiment, one slit is covered with
red filter and another slit is covered by green filter, then
interference pattern will be

5. When monochromatic light is replaced by white light in Fresnel’s biprism arrangement, the central fringe is

6. The device which produces highly coherent sources is

7.  Which of the following is correct for light diverging from a point source?

8. When unpolarised light is incident on a plane glass plate at Brewster’s angle, then which of the following statements is correct?

9. Polarization of light prove the :

10. The locus of all particles in a medium, vibrating in the same phase is called

11. The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :

12. Polaroid glass is used in sun glasses because

13. A monochromatic light is refracted from air into a glass of refractive index µ. The ratio of the wavelengths of the incident and the refracted waves is:

14. Laser light is considered to be coherent because it consists of

15. In a double slit interference pattern, the first maxima for infrared light would be

16. The diffraction effects in a microscopic specimen become important when the separation between two points is

17. C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?

18. Two lenses having power +6 D and -4 D are placed in contact. The power of the combination is

19. Huygen’s concept of secondary wave

20. The electromagnetic wave theory of light fails to explain :