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Assertion: For best contrast between maxima and minima in the interference pattern of young's double slit experiment , the intensity of light emerging out of the two slits should be equal. Reason: The intensity of interference pattern is proportional to square of amplitude.

1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true but reason is not the correct explanation of assertion.
3. If Assertion is true but reason is false.
4. If both assertion and reason are false.

Correct answer: If both assertion and reason are true but reason is not the correct explanation of assertion.

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