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Question

Interference of light from two sources can be observed if

A
The sources are independent.
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B
The sources are of different frequencies and random phases.
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C
The sources are of different frequency.
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D
The sources are coherent.
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Solution

The correct option is D The sources are coherent.
Interference of light from two sources can be observed if the sources are coherent . It means that the phase difference between two sources must be constant with time . Two independent sources can't produce an interference pattern .

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