Interference and Diffraction Questions and Answers | Online Quiz for Practice

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?

1. It will turn to dark
2. It will turn to bright
3. Bands will disappear
4. It will be a mixture of all colors

47. Light enters air from water. The angle of refraction will be

1. Greater than the angle of incidence.
2. Equal to the angle of incidence.
3. Less than the angle of incidence.
4. None of these

48. Light is

1. an electromagnetic wave
2. a form of energy visible to the human eye
3. the same type of energy as an X ray
4. all of the above

49. Light travels fastest

1. In a vacuum
2. through water
3. Through glass
4. through diamond

50. Newtons light illustrate the phenomenon of

1. Interference
2. Diffraction
3. Dispersion
4. Polarization

51. Newtons light illustrate the phenomenon of

1. Interference
2. Diffraction
3. Dispersion
4. Polarisation

52. Newtons rings are formed because of interference between the light Reflected from

1. Upper surface of Plano-convex lens and lower surface of plane glass plate
2. Lower surface of Plano-convex lens and upper surface of plane glass plate
3. Lower and upper surface of Plano-convex
4. Lower and upper surfaces 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)?

1. Radius (or diameter) will remain constant but there will be more brightness
2. Radius (or diameter) will increase
3. Radius (or diameter) will decrease
4. There will be no effect

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)?

1. Radius (or diameter) will remain constant but there will be more brightness
2. Radius (or diameter) will increase
3. Radius (or diameter) will decrease
4. There will be no effect

55. On a rainy day, small oil films on water show brilliant colors. This is due to

1. dispersion
2. interference
3. diffraction
4. Polarization

56. Optical fiber works on the

1. principle of refraction
2. total internal reflection
3. scattering
4. interference

57. Radio telescopes are better than optical telescopes because

1. they can detect faint galaxies which no optical telescope can
2. they can work even in cloudy conditions
3. they can work during the day and night
4. All of the above

58. Rainbow is due to

1. absorption of sunlight in minute water droplets
2. diffusion of sunlight through water droplets
3. ionization of water deposits
4. refraction and reflection of sunlight by water droplets

59. Second glass plate in Michelson s Interferometer is known as

1. Extra glass plate
2. Compensating glass plate
3. Simple Glass Plate
4. None of these

60. significant diffraction of X ray can be obtained

1. By a single slit
2. By a double slit
3. By diffraction
4. By Atomic crystal