Interference and Diffraction Questions and Answers in Quiz Form 9 for Practice

121. Antireflection coating is helps in which case of the following?

1. To allow maximum light to reflect from top surface
2. To allow minimum light to enter into the medium
3. Minimizing the reflection of light from top surface
4. To absorb and control the amount of light entering into the medium

122. As a wave travels down a spring, the amplitude slowly decreases. Why does this occur?

1. The wave slows down as it travels along the spring.
2. Some energy is lost due to friction as the particles in the spring rub against each other
3. The law of conservation of energy does not apply to waves.
4. The energy is spread out along the entire length of the spring.

123. as the order increases, the width of a dark band in diffraction patterns

1. Does not change
2. becomes infinity
3. Increases
4. Decreases

124. Coherent light of a single frequency passes through a double slit with a separation d, to produce a pattern on a screen as distance D from the slits. What would cause the separation between adjacent minima on the screen to increase?

1. increase the distance
2. increase the frequency of the incident light
3. increase the index of refraction of the medium in which the setup is immersed
4. increase the separation d between the slits