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Question

Two identical lights sources S1 and S2 emit the light of same wavelength λ. These light rays will exhibit interference if

A
their phase difference remain constant.
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B
their phase difference is distributed randomly.
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C
their light intensities remain constant.
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D
their light intensities change continuously.
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Solution

The correct option is A their phase difference remain constant.
For interference to take place the light sources need to be either in phase or have a constant phase difference. In case the phase difference keeps changing the interference pattern will keep on changing, as a result of interference pattern will be observed.

Answer. A) Thier phase difference remain constant.

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