Interference was observed in interference chamber where 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 brighter bands
c
interference with dark bands
d
interference fringe with larger width
answer is D.
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Detailed Solution
In vacuum, λ increases very slightly compared to that in air. As β=λDd ∴β ∝ λ, therefore, width of interference fringe increases slightly.