Q.

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

answer is D.

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Detailed Solution

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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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