A) two light sources must have the same wave length
B) two point sources should have the same amplitude and same wavelength
C) two sources should have the same wave, length, nearly the same amplitude and have a constant phase difference
D) two point sources should have a randomly varying phase difference
Correct Answer: C
Solution :
Two sources should have the same wavelength, nearly the same amplitude and have a constant phase difference. If the phase difference between two interfering waves does not remain constant, interference pattern will not be Sustained.
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