Interference was observed in interference chamber when air was pr… - Vidyadip

MCQ

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

A
No interference
B
Interference with bright bands
C
Interference with dark bands
✓
Interference in which width of the fringe will be slightly increased

✓

Answer

Correct option: D.

Interference in which width of the fringe will be slightly increased

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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