Wave Optics
Quiz by Indira Menon
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- 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