Interference and Diffraction Multiple Choice Questions and Answers

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

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

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

1. it will refract away from the normal
2. some of the light may be reflected
3. all of the light may be reflected
4. all of A, B, and C

93. 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

1. pi
2. 2 pi
3. pi /2

94. 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

1. pi
2. 2pi
3. pi/2

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

1. Reflected, in phase
2. Reflected out of phase by 180 degree
3. reflected, they are completely absorbed

96. 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

1. Increases Remains the same
2. Remains the same Decreases
3. Remains the same remains the same
4. Decreases Decreases

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

1. Dark
2. Multi colored
3. Bright
4. None of these

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

1. Source must be close to slit and screen should be at infinite distance
2. Both source and screen must be close to slit
3. Source must be at infinity and screen should be close to the slit
4. Both source and screen must be at infinity

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

1. Interference
2. Compton effect
3. Polarisation
4. Diffraction

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

1. Radio waves
2. Gamma rays
3. Magnetic waves
4. Sound waves