Interference (Young's double-slit experiment and expression for fringe width, coherent sources,..) NEET Questions

Physics - Optics

Interference (Young's double-slit experiment and expression for fringe width, coherent sources,..) MCQ Questions


13.
The fringe width in Young’s double-slit experiment is directly proportional to:

NEET - 2017

A.
Wavelength of light
B.
Separation between slits
C.
Distance between slits and screen
D.
All of these
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ANSWER :
D. All of these
14.
What is the minimum condition required for two waves to be coherent?
A.
Same frequency
B.
Same phase
C.
Same amplitude
D.
Same speed
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ANSWER :
B. Same phase
15.
The fringe width in Young’s double-slit experiment depends on:
A.
Both wavelength and slit separation
B.
Only slit separation
C.
Only wavelength of light
D.
Neither wavelength nor slit separation
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ANSWER :
A. Both wavelength and slit separation
16.
If the wavelength of light used in Young’s experiment is increased, the fringe width:

NEET - 2019

A.
Decreases
B.
Increases
C.
Remains unchanged
D.
Becomes zero
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ANSWER :
B. Increases
17.
Which of the following does NOT affect the fringe width in Young’s double-slit experiment?
A.
Amplitude of light waves
B.
Refractive index of the medium
C.
Intensity of light
D.
Phase difference
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ANSWER :
C. Intensity of light
18.
What happens to the fringe width if the entire setup is immersed in water?
A.
Decreases
B.
Remains the same
C.
Increases
D.
Vanishes
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ANSWER :
A. Decreases