Initially interference is observed with the entire experimental set...

Initially interference is observed with the entire experimental set up inside a chamber filled with air. Now the chamber is evacuated. With the same source of light used, a careful observer will find that

Options

AThe interference pattern is almost absent as it is very much diffused.
BThere is no change in the interference pattern.
CThe fringe width is slightly decreased.
DThe fringe width is slightly increased.

Correct answer

D. The fringe width is slightly increased.

Step-by-step solution

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