# Wave Optics

## Quiz by Indira Menon

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40 questions
• Q1

was first observed in the interference chamber, when air was present, now the chamber is evacuated, and if the same light is used then a careful observer will see:

interference with dark bands.

interference with bright bands.

no interference

interference in which breadth of the fringe will be slightly increased.

60s
• Q2

Huygen’s wave theory of light can not explain

Photoelectric effect

diffraction

polarisation

interference

60s
• Q3

Wave optics is valid when characteristic dimensions are

much smaller than the wavelength of light

of the same order as the wavelength of light.

of the order of 1 mm.

much larger than the wave length of light.

60s
• Q4

Ray optics is valid when the characteristic dimensions are

much larger than the wavelength of light.

of the same order as the wavelength of light.

much smaller than the wavelength of light.

of the order of 1 mm.

60s
• Q5

Interference pattern is obtained on a screen due to two identical coherent sources of monochromatic light. The intensity of the central bright fringe is1. When one of the sources is blocked, its intensity becomes I0. The intensity in two situations is related as:

I = I0

I = 2I0

I = 4I0

I = 3I0

60s
• Q6

If a source of light is moved away from a stationary observer, then the frequency of light wave appears to change because of:

Doppler’s effect

All of these

interference

diffraction

60s
• Q7

When seen in green light, the saffron and green portions of our National Flag will appear

black and green respectively

green and yellow respectively

black

green

60s
• Q8

Light travels through a glass plate of thickness t and having a refractive index µ. If c be the velocity of light in vaccum, the time taken by light to travel this thickness of glass is

tc µ

tµc

tµ c

tµc

60s
• Q9

In Young’s Double Slit experiment using sodium light (λ =5898 Å), 92 fringes are seen. If green colour (5461 Å) is used, how many fringes will be seen?

62

99

67

85

60s
• Q10

Young’s experiment established that:

light consists of both waves and particles.

none of these

light consists of particles.

light consists of waves.

60s
• Q11

The condition for observing Fraunhoffer diffraction from as ingle slit is that the light wave front incident on the slit should be:

cylindrical

spherical

plane

none of these

60s
• Q12

Which of the following establishes the transverse nature of light

interference

polarisation

refraction

Diffraction

60s
• Q13

Light appears to travel in straight line since

none of these

Its wavelength is very small.

Its wavelength is very large.

It is absorbed by atmosphere.

60s
• Q14

If n represents the order of a half period zone, the area of this zone is nearly proportional to nm. where m is equalto

1

Zero

2

12

60s
• Q15

Two coherent monochromatic light beams of intensities I and4I are superimposed. The maximum and minimum possible intensities in the resulting beam are

5I and 3I

5I and I

9I and I

9I and 3I

60s

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