Interference and Diffraction MCQ Multiple Choice Questions

Q: 91. The points of constructive interference of light are

Correct Answer is: Always bright

Q: 92. The principle on which fiber optics is based is

Correct Answer is: Total internal reflection

Q: 93. The Radius (or diameter) of bright rings in Newtons rings is

Correct Answer is: Directly proportional to the square root of odd numbers

Q: 94. The Radius (or diameter) of dark rings in Newtons rings is

Correct Answer is: Directly proportional to the square root of natural numbers

Q: 95. The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called

Correct Answer is: Ultra-Violet

Q: 96. The speed of any mechanical wave as it propagates through a medium is dependent mainly on the

Correct Answer is: type of medium through which the wave travels

Q: 100. To find prominent diffraction, the size of diffraction object should be

Correct Answer is: comparable to order of wavelength of light

Q: 101. Two sources of light are said to be coherent if

Correct Answer is: they produce waves of the same amplitude

Q: 102. What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

Correct Answer is: Intensity of central maxima will increase

Q: 106. What is the nature of interference pattern for thin film of wedge shaped

Correct Answer is: Convex outside

91. The points of constructive interference of light are

Always bright
may be bright or dark
always dark
neither bright nor dark

92. The principle on which fiber optics is based is

refraction
polarization
Dispersion.
Total internal reflection

93. The Radius (or diameter) of bright rings in Newtons rings is

Directly proportional to the square root of odd numbers
Inversely proportional to the square root of natural numbers
Directly proportional to the square root of even numbers
Directly proportional to the square root of natural numbers

94. The Radius (or diameter) of dark rings in Newtons rings is

Directly proportional to the square root of odd numbers
Inversely proportional to the square root of natural numbers
Directly proportional to the square root of even numbers
Directly proportional to the square root of natural numbers

95. The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called

IR
Ultra-Violet
RF
Gamma ray

96. The speed of any mechanical wave as it propagates through a medium is dependent mainly on the

frequency of the wave source
wavelength
period of the wave
type of medium through which the wave travels

97. The speed of light in material A is 1.25 times as large as it is in material. What is the ratio of the refractive indices, µA /µB of these materials?

1.5
1
0.8
1.25

98. The wave nature of light is demonstrated by which of the following?

The photoelectric effect
Color
The speed of light
Diffraction

99. There are two types of diffraction Fresnel and ..........

Michelson
De Broglie
Fraunhofer
Huygens

100. To find prominent diffraction, the size of diffraction object should be

greater than wavelength of light used
comparable to order of wavelength of light
less than wavelength of light used
none of these

101. Two sources of light are said to be coherent if

they produce waves of the same wave length
they have the same amplitude of vibration
they produce waves in the medium simultaneously
they produce waves of the same amplitude

102. What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

Intensity of central maxima will decrease
Intensity of central maxima will increase
There will not be any effect
Diffraction pattern will disappear

103. What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 A^o by means of diffraction grating with 5000 lines/cm?

2
4
8
16

104. What is the name of the process whereby waves travel around corners and obstacles in their paths?

Reflection
Refraction
Interference
Diffraction

105. What is the nature of interference pattern at the contact edge of wedge shaped film

Always bright
Always dark
Bright or dark depending upon the thickness of other end
Bright or dark depending upon the wavelength of the light

106. What is the nature of interference pattern for thin film of wedge shaped

Concave outside
Convex outside
Equally spaced
Concave inside

107. What is the nature of interference pattern for thin film of wedge shaped

Concave outside
Convex outside
Equally spaced
Concave inside

108. What is the speed of light in glycerin (n = 1.47) expressed in terms of the speed of light in a vacuum?

2.04c
1.47c
0.680c
1.00c

109. What is true for intensity of scattered light according to Rayleighs law?

The intensity for scattering for light of largest wavelength more
The light of smallest wavelength will be scattered more
All the wavelengths are scattered equally
Intensity of light is not affected by scattering

110. When a light ray travelling in glass is incident on an air surface

it will refract away from the normal
some of the light may be reflected
all of the light may be reflected
all of A, B, and C

111. When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to

pi
2 pi
pi /2

112. When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to

pi
2pi
pi/2

113. When electromagnetic waves strike the boundary of denser medium they are

Reflected, in phase
Reflected out of phase by 180 degree
reflected, they are completely absorbed

114. When light passes from air into water, the frequency of the light remains the same. What happens to the speed? And the wavelength of light as it crosses the boundary in going from air into water? Speed Wavelength

Increases Remains the same
Remains the same Decreases
Remains the same remains the same
Decreases Decreases

115. When Newtons rings interference pattern is viewed from above by means of reflected light, the central spot is

Dark
Multi colored
Bright
None of these

116. Which of the following condition is essential for observing Fraunhofer diffraction?

Source must be close to slit and screen should be at infinite distance
Both source and screen must be close to slit
Source must be at infinity and screen should be close to the slit
Both source and screen must be at infinity

117. Which of the following does not support the wave nature of light

Interference
Compton effect
Polarisation
Diffraction

118. Which of the following does NOT travel in a vacuum?

Radio waves
Gamma rays
Magnetic waves
Sound waves

119. Which of the following phenomenon cannot be explained on the particle nature of light

Photo Electric Effect
Comptons Effect
Pair Production
Interference

120. Which of the following phenomenon produces colors in soap bubble?

Interference
Diffraction
Polarization
Dispersion

Interference and Diffraction MCQ Multiple Choice Questions - Page 4 for Practice

91. The points of constructive interference of light are

92. The principle on which fiber optics is based is

93. The Radius (or diameter) of bright rings in Newtons rings is

94. The Radius (or diameter) of dark rings in Newtons rings is

95. The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called

96. The speed of any mechanical wave as it propagates through a medium is dependent mainly on the

97. The speed of light in material A is 1.25 times as large as it is in material. What is the ratio of the refractive indices, µA /µB of these materials?

98. The wave nature of light is demonstrated by which of the following?

99. There are two types of diffraction Fresnel and ..........

100. To find prominent diffraction, the size of diffraction object should be

101. Two sources of light are said to be coherent if

102. What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

103. What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 A^o by means of diffraction grating with 5000 lines/cm?

104. What is the name of the process whereby waves travel around corners and obstacles in their paths?

105. What is the nature of interference pattern at the contact edge of wedge shaped film

106. What is the nature of interference pattern for thin film of wedge shaped

107. What is the nature of interference pattern for thin film of wedge shaped

108. What is the speed of light in glycerin (n = 1.47) expressed in terms of the speed of light in a vacuum?

109. What is true for intensity of scattered light according to Rayleighs law?

110. When a light ray travelling in glass is incident on an air surface

111. When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to

112. When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to

113. When electromagnetic waves strike the boundary of denser medium they are

114. When light passes from air into water, the frequency of the light remains the same. What happens to the speed? And the wavelength of light as it crosses the boundary in going from air into water? Speed Wavelength

115. When Newtons rings interference pattern is viewed from above by means of reflected light, the central spot is

116. Which of the following condition is essential for observing Fraunhofer diffraction?

117. Which of the following does not support the wave nature of light

118. Which of the following does NOT travel in a vacuum?

119. Which of the following phenomenon cannot be explained on the particle nature of light

120. Which of the following phenomenon produces colors in soap bubble?

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Interference and Diffraction MCQ Multiple Choice Questions - Page 4 for Practice

91. The points of constructive interference of light are

92. The principle on which fiber optics is based is

93. The Radius (or diameter) of bright rings in Newtons rings is

94. The Radius (or diameter) of dark rings in Newtons rings is

95. The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called

96. The speed of any mechanical wave as it propagates through a medium is dependent mainly on the

97. The speed of light in material A is 1.25 times as large as it is in material. What is the ratio of the refractive indices, µA /µB of these materials?

98. The wave nature of light is demonstrated by which of the following?

99. There are two types of diffraction Fresnel and ..........

100. To find prominent diffraction, the size of diffraction object should be

101. Two sources of light are said to be coherent if

102. What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?

103. What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 Ao by means of diffraction grating with 5000 lines/cm?

104. What is the name of the process whereby waves travel around corners and obstacles in their paths?

105. What is the nature of interference pattern at the contact edge of wedge shaped film

106. What is the nature of interference pattern for thin film of wedge shaped

107. What is the nature of interference pattern for thin film of wedge shaped

108. What is the speed of light in glycerin (n = 1.47) expressed in terms of the speed of light in a vacuum?

109. What is true for intensity of scattered light according to Rayleighs law?

110. When a light ray travelling in glass is incident on an air surface

111. When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to

112. When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to

113. When electromagnetic waves strike the boundary of denser medium they are

114. When light passes from air into water, the frequency of the light remains the same. What happens to the speed? And the wavelength of light as it crosses the boundary in going from air into water? Speed Wavelength

115. When Newtons rings interference pattern is viewed from above by means of reflected light, the central spot is

116. Which of the following condition is essential for observing Fraunhofer diffraction?

117. Which of the following does not support the wave nature of light

118. Which of the following does NOT travel in a vacuum?

119. Which of the following phenomenon cannot be explained on the particle nature of light

120. Which of the following phenomenon produces colors in soap bubble?

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103. What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 A^o by means of diffraction grating with 5000 lines/cm?