Interference was observed in interference chamber when air was present. Now, the chamber is evacuated and the same light is used. A careful observer will see:
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a
No interference
b
Interference with dark bands
c
Interference with bright bands
d
Interference in which width of the fringe will be slightly increased
answer is D.
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Detailed Solution
If λv be the wavelength of light in vaccum and that in air be λa,then where μa is R.I of air.In air