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

Physics · NEET · NTA ExamsOptics

The necessary condition for an interference by two sources of light is that
  1. two light sources must have the same wavelength
  2. two point sources should have the same amplitude and same wavelength
  3. two sources should have the same wavelength, nearly the same amplitude and have a constant phase difference
  4. two point sources should have a randomly varying phase difference

Answer

(C) two sources should have the same wavelength, nearly the same amplitude and have a constant phase difference

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