The necessary condition for an interference by two sources of light is that

Question

The necessary condition for an interference by two sources of light is that (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

Tardigrade Admin · Accepted Answer

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.

Q. The necessary condition for an interference by two sources of light is that

two light sources must have the same wave length

two point sources should have the same amplitude and same wavelength

two sources should have the same wave, length, nearly the same amplitude and have a constant phase difference

two point sources should have a randomly varying phase difference

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.