Two identical sources of light S1 and S2 emit light of same wavelength, the light rays emanating from them will interfere if

Options :
  1. phase difference between them remains constant
  2. phase difference between them changes randomly
  3. their intensities of light are constant
  4. their intensities of light randomly change
Answer and Explanation :-

Answer: Option 1

Explanation:

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I stop stretching and face him, unwilling to back down from this visual standoff. I'm not going to let him perform his little Jedi mind tricks on me, no matter how much I wish I could perform them on him. He's completely unreadable and even more unpredictable. It pisses me off.
-Colleen Hoover Hopeless