Interference and Diffraction Objective Question and Answer
Interference and Diffraction MCQ Multiple Choice Questions - Page 2 for Practice
31. In Newtons rings experiment, if we reduce the radius of curvature of Plano convex lens to zero, what will be effect on Newtons rings?
Correct Answer is: They will disappear
32. In Newtons rings experiment, if we reduce the radius of curvature of PlanoConvex lens to zero, what will be effect on Newtons rings?
Correct Answer is: They will disappear
33. In Newtons rings the central spot is
Correct Answer is: can be bright or dark
34. In plane transmission grating, the angle of diffraction for second order maxima for wavelength 5 x 10-5 cm is 30 degree. Calculate the number of lines in one centimeter of the grating surface
Correct Answer is: 5000 lines/cm
35. In reference with antireflection coating which of the following statement is true?
Correct Answer is: Thickness of the film should be increased for light of same wavelength but higher intensity
36. In reflected light the central fringes of Newtons ring is
Correct Answer is: dark
37. In thin film of wedge shaped, by keeping all other parameters constant, if only wavelength of incident light is increased. What will be the effect on bandwidth?
Correct Answer is: Bandwidth increases
38. In wedge shaped film the interference pattern has nature
Correct Answer is: Parallel to contact edge
39. Interference in thin film is mainly because of
Correct Answer is: Division amplitude
40. Interference in thin film is mainly because of
Correct Answer is: Division amplitude
41. Interference of light is evidence that
Correct Answer is: Light is a wave phenomenon
42. Interference pattern is observed in wedge-shaped film and bandwidth is noted. Now the angle of wedge is reduced to zero. What will be the effect on Bandwidth?
Correct Answer is: Bands will disappear
43. Interference pattern is observed in wedge-shaped film and bandwidth is noted. Now the angle of wedge is reduced. What will be the effect on bandwidth?
Correct Answer is: Bandwidth increases
44. Interference pattern is observed in wedge-shaped film and bandwidth is noted. Now the thin film is replaced by the film of higher refractive index. What will be the effect on bandwidth?
Correct Answer is: Bandwidth decreases
45. Interference pattern is observed in wedge-shaped film for monochromatic light. Now monochromatic light is replaced by white light. What will be the effect on interference pattern?
Correct Answer is: It will be a mixture of all colors
46. Interference pattern is observed in wedge-shaped film for monochromatic light. Now monochromatic light is replaced by white light. What will be the effect on interference pattern?
Correct Answer is: It will be a mixture of all colors
47. Light enters air from water. The angle of refraction will be
Correct Answer is: Less than the angle of incidence.
48. Light is
Correct Answer is: all of the above
49. Light travels fastest
Correct Answer is: In a vacuum
50. Newtons light illustrate the phenomenon of
Correct Answer is: Interference
51. Newtons light illustrate the phenomenon of
Correct Answer is: Interference
52. Newtons rings are formed because of interference between the light Reflected from
Correct Answer is: Lower surface of Plano-convex lens and upper surface of plane glass plate
53. Newtons rings experiment is performed and radius (or diameter) is calculated. Now Plano-convex lens is replaced with another Plano-convex lens of greater Radius of curvature. What will be effect on radius (or diameter)?
Correct Answer is: Radius (or diameter) will increase
54. Newtons rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)?
Correct Answer is: Radius (or diameter) will decrease
55. On a rainy day, small oil films on water show brilliant colors. This is due to
Correct Answer is: interference
56. Optical fiber works on the
Correct Answer is: total internal reflection
57. Radio telescopes are better than optical telescopes because
Correct Answer is: All of the above
58. Rainbow is due to
Correct Answer is: refraction and reflection of sunlight by water droplets
59. Second glass plate in Michelson s Interferometer is known as
Correct Answer is: Compensating glass plate
60. significant diffraction of X ray can be obtained
