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