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Why coherent sources are required for interference?

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Why coherent sources are required for interference? (Asked Poonam)

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@lastneutrino
For two waves to interfere that is to superimpose on each other they must have a constant phase reltionship and the waves produced with constant phase relationship are produced by coherent sources.whether the waves will interfere constructively or destructively is another question depending on the nature of the phase relationship.

English: Interference of two waves Deutsch: In...

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