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Interference is observed only when the phase difference between the two waves is zero.

(a) True

(b) False

This question was addressed to me in exam.

I need to ask this question from Interference of Light topic in division Interference of Engineering Physics II

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Right option is (b) False

The best I can explain: For interference pattern, the phase difference between the two rays must be constant. It is not necessary that the phase difference between the two rays has to be zero.

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