Interference and Diffraction Multiple Choice Questions and Answers

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