What do you mean by coherent sources? How are they realized in practice?

Coherent sources : Two sources are said to be coherent if they emit light waves of same frequency, nearly equal amplitude and are always in phase with each other.

Realization in practice : In practice it is not possible to have two independent sources which are coherent. But for experimental purpose, two virtual sources formed by a single source can act as coherent sources. Methods have been devised where (i) interference of light takes place between waves from the real source and a virtual source (ii) Interference of light takes place between waves from two sources formed due to a single source.

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