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Interference was observed in interferenc...

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

A

No interference

B

Interference with bright bands

C

Interference with dark bands

D

Interference in which width of the fringe will be slightly increased

Text Solution

Verified by Experts

The correct Answer is:
D
As refractive index of air is slightly more than 1, when the chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.
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