Assertion: When a concave mirror is held under water, its focal length will increase. Reason: The focal length of a concave mirror is independent of the medium in which it is placed.
1. Both assertion and reason are true reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false
4. Assertion is false, but reason is true
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1. Both assertion and reason are true reason is the correct explanation of assertion.
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