Two light sources are said to be coherent if they are obtained

Options :
  1. from the different point sources emitting light of same wavelengths
  2. from a point source
  3. from an extended source
  4. None of the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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May I share with you a formula that in my judgment will help you and help me to journey well through mortality... First, fill your mind with truth second, fill your life with service and third, fill your heart with love.
-Thomas S. Monson