Coherence of two electromagnetic waves takes place if their phase difference is: Options: A . &nbspConstant in time B . &nbspConstant in space C . &nbspConstant in time and space D . &nbspNone of these

Coherence of two electromagnetic waves takes place if their phase difference is:

Question

Coherence of two electromagnetic waves takes place if their phase difference is:

Options:

A . Constant in time

B . Constant in space

C . Constant in time and space

D . None of these

Answer: Option C

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