Two light sources are said to be coherent if they
A)are of the same frequency.
B)are of the same amplitude.
C)are of the same frequency, and maintain a constant phase difference.
D)are of the same amplitude, and maintain a constant phase difference.
E)are of the same frequency and amplitude.

Question

Quizplus · Accepted Answer

Coherent light sources must have the same frequency and maintain a constant phase difference to produce stable interference patterns.

Two Light Sources Are Said to Be Coherent If They