If two light waves are coherent, which of the following is NOT necessary?
A) They must have the same velocity.
B) They must have the same wavelength.
C) They must have the same amplitude.
D) They must have the same frequency.
E) They must have a constant phase difference at every point in space.

Question

Quizplus · Accepted Answer

Coherent light waves must have the same frequency and a constant phase difference, but they do not need to have the same amplitude.

If Two Light Waves Are Coherent, Which of the Following