# Wave Optics MCQs Mock Test of Class 12th Physics

Welcome to your Wave Optics MCQs Mock Test of Class 12th Physics

1.
Q.1. The phenomenon of diffraction can be treated as interference phenomenon if the number of coherent sources is

2.
Q.2. The diffraction effects in a microscopic specimen become important when the separation between two points is

3.
Q.3. What is the Brewester’s angle for air to glass transition?( μag = 1.5)

4.
Q.4. When ordinary light is made incident on a quarter wave plate, the emergent light is

5.
Q.5. The locus of all particles in a medium, vibrating in the same phase is called

6.
Q.6. Which of the following is correct for light diverging from a point source?

7.
Q.7. Wavefront is the locus of all points, where the particles of the medium vibrate with the same

8.
Q.8. The phenomena which is not explained by Huygen’s construction of wavefront

9.
Q.9. Huygen’s concept of secondary wave

10.
Q.10. A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is

11.
Q.11. Spherical wavefronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wave fronts, immediately after reflection?

12.
Q.12. When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is

13.
Q.13. Two plane wavefronts of light, one incident on a thin convex lens and another on the refracting face of a thin prism. After refraction at them, the emerging wavefronts respectively become

14.
Q.14. When a film is illuminated by white light, its upper portion appears dark. Path difference between two reflected beams at the spot must be

15.
Q.15. If two coherent sources are vibrating in phase then we have constructive interference at any point P whenever the path difference is

16.
Question 16. Out of the following Statements which is not correct?

17.
Q.18. Which of the following, cannot produce two coherent sources?

18.
Q.17. The device which produces highly coherent sources is

19.
Q.19. Coherence is a measure of

20.
Q.20. Two sources of light are said to be coherent, when they give light waves of same

21.
Q.21. Intensity of light depends on

22.
Q.22. The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be

23.
Q.23. The correct formula for fringe visibility is

24.
Q.24. Laser light is considered to be coherent because it consists of

25.
Question 25. The angle of minimum deviation of a prism depends upon the aggie of:

26.
Question 26 he minimum value of the refractive index is:

27.
Question 27 Polarization of light prove the :

28.
Q.28. The interfering fringes formed by a thin oil film on water are seen in yellow light of sodium lamp. We find the fringes

29.
Q.29. In Young’s Double slit experiment, if the distance between the slit and screen (D) is comparable with fringe width (B), the fringe pattern on screen will

30.
Q.30. If Young’s double slit experiment is performed in water keeping the rest of the set-up same, the fringes will

31.
Q.31. In the Young’s Double slit experiment, when we place a converging lens after the slits and place the screen at the focus of the lens, it

32.
Q.32. The fringe width for red colours as compared to that for violet colour is approximately

33.
Q.33. In Young’s double slit experiment, the minimum amplitude is obtained when the phase difference of super-imposing waves is (where n = 1, 2, 3, …)

34.
Q.34. The fringe width in a Young’s double slit experiment can be increased if we decrease

35.
Q.35. 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

36.
Q.36. Instead of using two slits, if we use two separate identical sodium lamps in Young’s experiment, which of the following will occur?

37.
Q.37. Which of the following is not essential for two sources of light in Young’s double slit experiment to produce a sustained interference?

38.
Q.38. In Young’s double slit experiment, the locus of the point P lying in a plane with a constant path difference between the two interfering waves is

39.
Q.39. If the width of the slit in single slit diffraction experiment is doubled, then the central maximum of diffraction pattern becomes

40.
Q.40. A diffraction pattern is obtained by using beam of red. light what will happen, if red light is replaced by the blue light?

41.
Q.41. When monochromatic light is replaced by white light in Fresnel’s biprism arrangement, the central fringe is

42.
Q.42. The condition for observing Fraunhoffer diffraction from a single slit is that the light wavefront incident on the slit should be

43.
Q.43. Transverse nature of light was confirmed by the phenomenon of

44.
Q.44. In the case of linearly polarized light, the magnitude of the electric field vector

45.
Q.45. Unpolarized light is incident on a plane glass surface The angle of incidence so that reflected and refracted rays are perpendicular to each other, them

46.
Q.46. Light waves can be polarised because they

47.
Q.47. Light transmitted by nicol prism is

48.
Q.48. Optically active substances are those substances which

49.
Q.49. Polaroid glass is used in sun glasses because

50.
Q.50. In the propagation of light waves, the angle between the plane of vibration and plane of polarisaiton is