Interference and Diffraction Multiple Choice Questions and Answers

11. A wedge shaped thin has

1. Non-uniform thickness
2. Zero thickness at one end and it increasing towards other end
3. Zero thickness at both ends
4. Thickness increase and decrease alternately

12. A wedge shaped thin has

1. Non-uniform thickness
2. Zero thickness at one end and it increasing towards other end
3. Zero thickness at both ends
4. Thickness increase and decrease alternately

13. An index of refraction less than one for a medium would imply

1. That the speed of light in the medium is the same as the speed of light in vacuum
2. That the speed of light in the medium is greater than the speed of light in vacuum
3. Refraction is not possible
4. Reflection is not possible

14. An index of refraction less than one for a medium would imply

1. That the speed of light in the medium is the same as the speed of light in vacuum
2. That the speed of light in the medium is greater than the speed of light in vacuum
3. Refraction is not possible
4. Reflection is not possible

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

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

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

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

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

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

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

19. Colors in thin films are because of

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

20. Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen?

1. A sharp bright point of the width equal to width the pinhole
2. A bright point of the width equal to width the pinhole but of less intensity
3. A bright ring at the centre surrounded by alternate dark and bright rings
4. A diffused bright point