MCQ
Coherent sources of light produce constructive interference while there is a phase difference between them is :
  • A
    $\pi$
  • B
    $\pi / 2$
  • C
    $3 \pi / 2$
  • $2 \pi$

Answer

Correct option: D.
$2 \pi$
(D) - $2 \pi$

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