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Chapter 9
Physical Optics
Encircle the most appropriate answer among the following options
1. The corpuscular nature of light was given by choose which one is correct:
(a) Huygen
(b) Maxwell
(c) Newton
(d) Thomas young
2. Light is the source to choose which one is correct:
(a) Create energy
(b) Destroy energy
(c) Carry energy
(d) All of above
3. Wave theory of light was proposed by choose which one is correct:
(a) Thomas young
(b) Huygen
(c) Newton
(d) Maxwell
4. According to Newton, light travels in the form of choose which one is correct:
(a) Photons
(b) Waves
(c) Carpascular
(d) Electrons
5. Huygen proposed that light travels in spaced by means of wave motion in choose which one is correct:
(a) 1960
(b) 1690
(c) 1680
(d) 1670
6. Light is the type of choose which one is correct:
(a) Momentum
(b) Velocity
(c) Energy
(d) Acceleration
7. The light reaches the planet earth from the planet sun in plane choose which one is correct:
(a) Amplitude
(b) Frequency
(c) Wavelength
(d) Wavefronts
8. In interference and diffraction of light, the waves and wavefronts considered as choose which one is correct:
(a) Cylindrical
(b) Conical
(c) Spherical
(d) Plane
9. Huygen principle is used to explain the choose which one is correct:
(a) Dispersion of light
(b) Reflection of light
(c) Speed of light
(d) Propagation of light
10. The shape of wavefronts depends upon choose which one is correct:
(a) Shape of medium
(b) Viscosity of medium
(c) Density of medium
(d) All of above
11. The direction in which light energy is carried called choose which one is correct:
(a) Ray
(b) Wavefront
(c) Locus
(d) All of above
12. A plane wave is obtained if a point source of light is placed at the focus of a choose which one is correct:
(a) Glass
(b) Plane lens
(c) Mirror
(d) None of these
13. When the disturbance is propagated out in all directions from a point source, what will be the wavefronts choose which one is correct:
(a) Spherical
(b) Conical
(c) Plane
(d) None of these
14. All the points on a primary wavefront can be considered as the source for the production of secondary wavelets is choose which one is correct:
(a) Huygen principle
(b) Hertz principle
(c) Newton’s principle
(d) Maxwell’s principle
15. The electromagnetic theory was developed by choose which one is correct:
(a) Newton
(b) Huygen
(c) Maxwell
(d) Thomas young
16. Direction of propagation of light ray is choose which one is correct:
(a) Along the wavefront
(b) Perpendicular to wavefront
(c) At an angle of 45 0 to the plane of the wavefront
(d) None of these
17. Light waves are choose which one is correct:
(a) Complex
(b) Monochromatic
(c) Mixture of monochromatic and complex
(d) None of these
18. A medium which separates out a complex waves into component waves is called a choose which one is correct:
(a) Polarizing medium
(b) Refractive medium
(c) Dispersive medium
(d) None of these
19. When light waves pass through a dispersive medium what happens to them choose which one is correct:
(a) No effect at all
(b) Split into its component waves
(c) Both (a) and (b)
(d) None of these
20. When waves pass from one medium to another choose which one is correct:
(a) Their wavelength changes
(b) Their speed changes
(c) Frequency remains constant
(d) All of above
21. Electromagnetic theory of radiation failed to explain choose which one is correct:
(a) Compton effect
(b) Mass-energy relation
(c) Photoelectric effect
(d) All of them
22. Electromagnetic waves travel in free space with velocity equal to choose which one is correct:
(a) 3 x 1010 m/s
(b) 3 x 108 m/s
(c) 3 x 109 m/s
(d) 6 x 107 m/s
23. The first explanation of wave nature of light was provided in 1801 by the experiment of choose which one is correct:
(a) Maxwell
(b) Thomas young
(c) Huygen
(d) Newton
24. Huygen’s principle is used to explain choose which one is correct:
(a) The speed of light
(b) The polarisation
(c) Locate the wavefront
(d) None of these
25. The locus of all points in a medium having the same phase of vibration will be known as choose which one is correct:
(a) Wavefront
(b) Wavelength
(c) Focal length
(d) None of these
26. Huygen principle states that choose which one is correct:
(a) Light travel in electromagnetic waves
(b) Light has dual nature
(c) Light travel in straight line
(d) All points on primary wavefront are source of secondary wavelets
27. The phenomenon of the resultant wave obtained by overlapping of two or more waves is called choose which one is correct:
(a) Reflection
(b) Refraction
(c) Interference
(d) Polarisation
28. The monochromatic sources of light emit waves having a constant phase difference are called choose which one is correct:
(a) Reliable sources
(b) Unreliable sources
(c) Primary sources
(d) Coherent sources
29. Interference effects of light was verified by choose which one is correct:
(a) Bragg
(b) Newton
(c) Thomas young
(d) None of the above
30. Which one of the following is monochromatic light source choose which one is correct:
(a) Light from simple lamp
(b) Light from sodium lamp
(c) Light from fluouscent
(d) Light from neon lamp
31. Two sources of light are coherent if they emit rays of which among the following choose which one is correct:
(a) Same amplitude
(b) Same wavelengths
(c) Same amplitude and wavelength
(d) Same wavelength with constant phase coherence
32. When the crest of one wave falls on the crest of the other waves, this phenomena is known as choose which one is correct:
(a) Polarisation
(b) Dispersion
(c) Constructive interference
(d) Destructive interference
33. When crest of one wave falls over the trough of other wave, this phenomenon is known as choose which one is correct:
(a) Diffraction
(b) Polarisation
(c) Constructive interference
(d) Destructive interference
34. The blue of the sky is due to choose which one is correct:
(a) Diffraction
(b) Reflection
(c) Polarisation
(d) Scattering
35. In order to get interference of light waves choose which one is correct:
(a) The sources should be monochromatic
(b) The sources should be phase coherent
(c) The law of superposition should be applicable
(d) All of above
36. The condition for constructive interference of two waves is that the path difference should be choose which one is correct:
(a) Integral multiple of
(b) Integral multiple of
(c) Even integral multiple of
(d) None of these
37. The condition for destructive interference of two waves is that the path difference should be choose which one is correct:
(a) Integral multiple of
(b) Integral multiple of
(c) Odd integral multiple of
(d) None of these
38. In young’s double slit experiment, the path difference for bright fringe is choose which one is correct:
(a) d cos = m
(b) d sin m
(c) d sec = m
(d) d tan m
39. Indicate When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes ar observed, the wavelength of light used is choose which one is correct:
(a) 5000 nm
(b) 5000 Ao
(c) 500 cm
(d) 2000 Ao
40. The wavelength of X-rays is of the order of choose which one is correct:
(a) 10Ao
(b) 1000 Ao
(c) 1 Ao
(d) 100 Ao
41. Wavelength of X-rays falling at glancing angle of 300 on a crystal with atomic spacing 2 x 10-10 m for the first order diffraction is choose which one is correct:
(a) 4 x 1010 m
(b) 2 x 1010 m
(c) 0.2 x 1010 m
(d) 20x 1010 m
42. In young’s experiment if white light is used choose which one is correct:
(a) Dark fringe will be seen
(b) Bright fringe will be seen
(c) Alternate dark and bright fringes will be seen
(d) No fringe will be seen
43. What is the distance between any two consecutive bright fringes is known as choose which one is correct:
(a) Wavelet
(b) Fringe spacing
(c) Amplitude
(d) Wavelength
44. The interference fringe spacing depends upon choose which one is correct:
(a) Separation between the sources
(b) The wavelength of light used
(c) The distance of screen from the source
(d) All of above
45. A thin film is transparent medium whose thickness is comparable with wavelength of choose which one is correct:
(a) Sound
(b) Heat
(c) Light
(d) None of these
46. A thin layer of oil on the surface of water looks coloured due to choose which one is correct:
(a) Transmission of light
(b) Polarization of light
(c) Interference of light
(d) None of these
47. Soap film in sunlight appears coloured due to choose which one is correct:
(a) Diffraction of light
(b) Scattering of light
(c) Interference of light
(d) Dispersing of light
48. Brilliant and beautiful colours in soap bubbles on surface of water are due to choose which one is correct:
(a) Interference of heat
(b) Interference of light
(c) Interference of sound
(d) All of the above
49. A white light passed through a prism is choose which one is correct:
(a) Polarized
(b) Dispersed
(c) Diffracted
(d) Deviated
50. Newton’s rings are formed due to choose which one is correct:
(a) Reflection of light
(b) Polarization of light
(c) Interference of light
(d) Diffraction of light
51. When Newton’s rings interference is seen by mean of reflected light, the central spot is choose which one is correct:
(a) Dark
(b) Bright
(c) Blue
(d) Red
52. Michelson interferometer can be used to find the choose which one is correct:
(a) Wavelength of light
(b) Wavelength of sound
(c) Velocity of sound
(d) Velocity of light
53. The Michelson formula for displacement L is choose which one is correct:
(a) L = m
(b) L = 2m
(c) L = 2m
(d) L =
54. Michelson interferometer was devised in choose which one is correct:
(a) 1987
(b) 1881
(c) 1687
(d) 1789
55. When one mirror of a Michelson interferometer is move a distance of 0.5 mm, 2000 fringes are observed, the wavelength of light used is choose which one is correct:
(a) 2000 Ao
(b) 1000 cm
(c) 5000 Ao
(d) None of these
56. The property of bending light when it passes from one medium to another medium is known as choose which one is correct:
(a) Dispersion of light
(b) Diffraction of light
(c) Reflection of light
(d) None of these
57. Diffraction effects are choose which one is correct:
(a) More for sharp edges
(b) Less for cylindrical
(c) Less for round edge
(d) Less for sharp edge
58. We get light inside a room in a day time due to choose which one is correct:
(a) Diffraction
(b) Refraction
(c) Interference
(d) Polarized
59. Diffraction effects was discovered in 1801 by choose which one is correct:
(a) Newton
(b) Henry
(c) Huygen
(d) W.L Bragg
60. if A glass plate having a large number of close parallel equidistant slits mechanically rules on it will known as choose which one is correct:
(a) Diffraction
(b) Diffraction grating
(c) Fring spacing
(d) All of the above
61. A diffraction grating has 500 lines per mm. Its grating element will be choose which one is correct:
(a) 500 mm
(b) 5 x 10-3 mm
(c) 2 x 10-3 mm
(d) 5 x 103 mm
62. The formula for grating element is choose which one is correct:
(a) d sin 0 =
(b) d sin 0 =
(c) d sin 0 =
(d) d sin 0 =
63. The condition for constructive interference in case of diffraction grating choose which one is correct:
(a) d sin 0 =
(b) 2d sin 0 =
(c) d sin 0 =
(d) d sin 0 =
64. Interference effects of light were verified by choose which one is correct:
(a) Thomas young
(b) Newton
(c) Einstein
(d) W.L Bragg
65. A fringe is a path of choose which one is correct:
(a) Constant phase
(b) Constant amplitude
(c) Same wavelength
(d) None of these
66. The main advantage of a grating over young’s apparatus is the choose which one is correct:
(a) Absence of bright light
(b) Greater deviation of light
(c) Absence of dark fringes
(d) Sharpness of bright lines
67. Michelson interferometer is based on the principle of choose which one is correct:
(a) Division of wavefronts
(b) Division of amplitude
(c) Addition of amplitude
(d) None of these
68. The blue of the sky is due to choose which one is correct:
(a) Polarization
(b) Reflection
(c) Refraction
(d) Scattering
69. The velocity of light was accurately measured by choose which one is correct:
(a) Newton
(b) Faraday
(c) Michelson
(d) Young
70. The wavelength of X-rays is choose which one is correct:
(a) 1000 Ao
(b) 10 Ao
(c) 1 Ao
(d) 100 Ao
71. Interference and diffraction of light support the choose which one is correct:
(a) Particle nature Of light
(b) Quantum nature of light
(c) Transverse nature of light
(d) Wave nature of light
72. Polarization of light shows that light is choose which one is correct:
(a) Extremely short wavelength
(b) Transverse waves
(c) Longitudinal waves
(d) Corpuscular in nature
73. Polarization of light takes place in choose which one is correct:
(a) Transverse waves
(b) Longitudinal waves
(c) Sound waves
(d) None of these
74. The polarization of an electromagnetic waves is determined by which among the following one choose which one is correct:
(a) Electric field
(b) Magnetic field
(c) Both electric and magnetic
(d) The direction of waves
75. A polarized is choose which one is correct:
(a) A light filter
(b) To analysed polarized light
(c) Used in polarimeter
(d) An adjustable shatter
76. Which one of the following cannot be polarized choose which one is correct:
(a) Sound waves
(b) Radio waves
(c) Ultraviolet rays
(d) X-rays
77. One angstrom is equal to choose which one is correct:
(a) 10-6 m
(b) 10-8 nm
(c) 10 10 nm
(d) 10-8 cm
78. Diffraction is a special type of choose which one is correct:
(a) Interference
(b) Reflection
(c) Polarization
(d) None of these
79. Young’s double slit experiment proves choose which one is correct:
(a) Dual nature of light
(b) Particle nature of light
(c) Wave nature of light
(d) None of these
80. Two light waves which are not coherent cannot choose which one is correct:
(a) Be interference
(b) Be diffracted
(c) Be polarized in the same plane
(d) None of these
81. Light on passing through a Polaroid is choose which one is correct:
(a) Unpolarized
(b) Plane polarized
(c) Elliptically polarized
(d) Circularly polarized
82. Longitudinal waves do not exhibit choose which one is correct:
(a) Diffraction
(b) Polarization
(c) Reflection
(d) Refraction
83. Light has choose which one is correct:
(a) Particle nature
(b) Wave nature
(c) Dual nature
(d) None of these
84. Light waves are choose which one is correct:
(a) Longitudinal waves
(b) Transverse waves
(c) Compressional waves
(d) none of these
85. Wave length of light on the average is given by choose which one is correct:
(a) 10-9
(b)10-10
(c) 10-4
(d) 10-6
86. Light waves are choose which one is correct:
(a) Mechanical waves
(b) Electromagnetic waves
(c) Matter waves
(d) None of these
87. Monochromatic light means waves of choose which one is correct:
(a) Same colour
(b) Same wavelength
(c) Same frequency
(d) All of these
88. The path difference ‘d’ for constructive interference should be choose which one is correct:
(a) d =
(b) d =
(c) d =
(d) d =
89. The equation 2d sin 0 = denotes choose which one is correct:
(a) Huygen’s principle
(b) Young’s double slit experiment
(c) Brogg’s equation
(d) Diffraction grating equation
90. Ultra-violet rays differ from x-rays in that ultraviolet rays choose which one is correct:
(a) cannot be diffracted
(b) cannot be polarized
(c) do not affect a photo-graphic plate
(d) have a lower frequency
91. Which one of the following cannot be polarized choose which one is correct?
(a) Radio waves
(b) Ultraviolet rays
(c) X-rays
(d) Sound waves
92. For which of the following colours will the fringe width be minimum in the double-slit experiment choose which one is correct:
(a) Violet
(b) Red
(c) Green
(d) Yellow
93. A diver in a lake wants to signal his distress to a person sitting on the edge of the lake flashing his water proof torch. He should direct the beam.
(a) Vertically upwards
(b) Horizontally
(c) At angle to the vertical which is slightly less than the critical angle
(d) At an angle to the vertical which is slightly more than critical angle
94. If The least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It could be act as a simple microscope of magnifying power which one is correct
(a) 4
(b) 5
(c) 6
(d) 3
95. The index of refraction of diamond is 2.0 velocity of light in diamond in m/sec. is choose which one is correct:
(a) 6 x 108
(b) 3 x 108
(c) 2 x 108
(d) 1.5 x 108
96. Light reaches the earth from sun in nearly choose which one is correct:
(a) 15 minutes
(b) 10 minutes
(c) 8 minutes
(d) 8 minutes 20 second
97. Longitudinal waves do not exhibit (show) choose which one is correct:
(a) Reflection
(b) Refraction
(c) Diffraction
(d) Polarisation
98. The danger signals are red while the eye is more sensitive to yellow because what among the following options choose which one is correct:
(a) Scattering in yellow colour is less than that of red
(b) Red light is longer in wavelength than yellow light
(c) Scattering in red is less than in yellow
(d) Red colour has greater frequency than yellow light
99. When crest of one wave falls over the crest of the other waves, this phenomenon is known as choose which one is correct:
(a) Destructive interference
(b) Constructive interference
(c) Dispersion
(d) Polarisation
100. In Young’s double experiment, if white light is used choose which one is correct:
(a) Bright fringes will be seen
(b) Dark fringes will be seen
(c) Alternate dark and bright fringes will be seen
(d) No interference fringes will be seen
101. In Young’s double slit experiment, if the distance between the slits is doubled and distance between the slits and the screen is halved, the fringe width or spacing will be one among the following option choose which one is correct:
(a) Half
(b) Double
(c) Four times
(d) One fourth