Assertion :For two source to be coherent phase difference between two waves at all points should be same. Reason: Two different light source are never coherent.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
For two waves to be coherent, the frequencies of the two waves must match and they must have a constant phase difference.
Two real light sources can never be coherent.
Hence assertion is incorrect, reason is correct. Option D is true.

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