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Assertion : Two point coherent sources of light S₁ and S₂ are placed on a line as shown. P and Q are two points on that line. If at point P maximum intensity is observed then maximum intensity should also be observed at Q. Reason : In the figure of assertion the distance |S₁ P-S₂ P | is equal to distance |S₂ Q-S₁ Q | .

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true but reason is not the correct explanation of assertion.

Step-by-step solution

If maximum intensity is observed at P then for maximum intensity to be also observed at Q, S₁ and S₂ must have phase difference of 2 m (where m is an integer).

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