First slide

Coherent sources and their importance in interference

Question

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

Easy

A

no interference
B

interference with brighter bands
C

interference with dark bands
D

interference fringe with larger width

Solution

In vacuum, $λ$ increases very slightly compared to that in air. As $β = \frac{λ D}{d} ∴ β \propto λ,$ therefore, width of interference fringe increases slightly.

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