Assertion :While calculating intensities in interference pattern, we can add the intensities of the individual waves. Reason: Principle of superposition is valid for linear waves.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect Reason is correct

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Solution

The correct option is D Assertion is incorrect Reason is correct
Principle of superposition of states that the amplitudes(displacements form mean position) of waves get added up when two waves produce and interference pattern.
Addition of intensities do not get added up, instead $I \propto A^{2}$ , so their square roots get added up, giving
$I = I_{1} + I_{2} + 2 \sqrt{I_{1} I_{2}} c o s δ$

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