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Interference was observed in interference chamber where air was present, now the chamber is evacuated, and if 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
Correct Option: D
In vaccum, λ increases very slightly compared to that in air. As β ∝ λ, therefore, width of interference fringe increases slightly.