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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

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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

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detailed solution

Correct option is D

β=λDμdThe refractive index of air is slightly more than 1. When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.


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