Which one of the following is NOT a necessary condition for two light sources to be…
PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
Which one of the following is NOT a necessary condition for two light sources to be coherent?
(a) They must emit waves of the same frequency.
(b) They must have the same state of polarization.
(c) They must emit waves of the same amplitude.
(d) They must maintain a constant phase difference.