Two light sources are coherent when

State conditions which must be satisfied for two light sources to be coherent.

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

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

If two sources are not coherent, then we obtain

Two light sources are said to be coherent if they are obtained from