Welcome to your Wave Optics MCQs Mock Test of Class 12th Physics
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Q.1. The phenomenon of diffraction can be treated as interference phenomenon if the number of coherent sources is
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Q.2. The diffraction effects in a microscopic specimen become important when the separation between two points is
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Q.3. What is the Brewester’s angle for air to glass transition?( μag = 1.5)
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Q.4. When ordinary light is made incident on a quarter wave plate, the emergent light is
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Q.5. The locus of all particles in a medium, vibrating in the same phase is called
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Q.6. Which of the following is correct for light diverging from a point source?
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Q.7. Wavefront is the locus of all points, where the particles of the medium vibrate with the same
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Q.8. The phenomena which is not explained by Huygen’s construction of wavefront
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Q.9. Huygen’s concept of secondary wave
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Q.10. A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is
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Q.11. Spherical wavefronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wave fronts, immediately after reflection?
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Q.12. When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is
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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
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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
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Q.15. If two coherent sources are vibrating in phase then we have constructive interference at any point P whenever the path difference is
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Question 16. Out of the following Statements which is not correct?
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Q.18. Which of the following, cannot produce two coherent sources?
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Q.17. The device which produces highly coherent sources is
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Q.19. Coherence is a measure of
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Q.20. Two sources of light are said to be coherent, when they give light waves of same
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Q.21. Intensity of light depends on
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Q.22. The colour of bright fringe nearest to central achromatic fringe in the interference pattern with white light will be
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Q.23. The correct formula for fringe visibility is
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Q.24. Laser light is considered to be coherent because it consists of
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Question 25. The angle of minimum deviation of a prism depends upon the aggie of:
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Question 26 he minimum value of the refractive index is:
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Question 27 Polarization of light prove the :
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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
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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
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Q.30. If Young’s double slit experiment is performed in water keeping the rest of the set-up same, the fringes will
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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
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Q.32. The fringe width for red colours as compared to that for violet colour is approximately
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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, …)
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Q.34. The fringe width in a Young’s double slit experiment can be increased if we decrease
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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
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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?
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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?
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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
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Q.39. If the width of the slit in single slit diffraction experiment is doubled, then the central maximum of diffraction pattern becomes
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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?
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Q.41. When monochromatic light is replaced by white light in Fresnel’s biprism arrangement, the central fringe is
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Q.42. The condition for observing Fraunhoffer diffraction from a single slit is that the light wavefront incident on the slit should be
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Q.43. Transverse nature of light was confirmed by the phenomenon of
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Q.44. In the case of linearly polarized light, the magnitude of the electric field vector
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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
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Q.46. Light waves can be polarised because they
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Q.47. Light transmitted by nicol prism is
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Q.48. Optically active substances are those substances which
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Q.49. Polaroid glass is used in sun glasses because
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Q.50. In the propagation of light waves, the angle between the plane of vibration and plane of polarisaiton is
