First slide

Young's double slit Experiment

Question

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

Easy

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

Solution

The 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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