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Q.
To observe a stationary interference pattern formed by two light waves, which of the following is not a necessary condition:
Wave Optics
Solution:
For sustained interference the phase difference
must remain conststant between the interfering waves, if it
varies with time then the resulting intensity at the point of
interference will change with time so the interfering waves
must be coherent. With change in amplitude and intensity of
the two waves, only the resulting intensity will be affected but
it does not change, hence option (B) and (D) are not necessary
for sustained interference