To demonstrate the phenomenon of interference, we require

Options :
  1. two sources which emit radiations of the same frequency
  2. two sources which emit radiations of different wavelength
  3. Two sources which emit radiations of different wavelength
  4. two sources which emit radiations of the same frequency and have a constant phase difference


Answer and Explanation :-

Answer: Option 4

Explanation:

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For the unified mind in accord with the Way all self-centered striving ceases. Doubts and irresolutions vanish and life in true faith is possible. With a single stroke we are freed from bondage nothing clings to us and we hold nothing. All is empty, clear, self-illuminating, with no exertion of the mind's power.
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