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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no interference

interference with brighter bands

interference with dark bands

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.

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