Home Maths JEE Main Full Syllabus Mock Test 75 Question New Syllabus. TEST 15 PCM Initially interference of monochromatic ligh…
Maths JEE Main Full Syllabus Mock Test 75 Question New Syllabus. TEST 15 PCM Single Correct MCQ
Published on: August 13, 2026

Initially interference of monochromatic light 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

A
The interference pattern is almost absent as it is very much diffused
B
There is no change in the interference pattern
C
The fringe width is slightly decreased
D
The fringe width is slightly increased

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Verified by Experts
The correct answer is:
D

since
since vacuum is made, λ increased fringe width increases

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