Assertion: A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length.
Reason: The refractive index of water is smaller than the refractive index of air.

Both assertion and reason are true but the reason is the correct explanation of assertion.

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Both assertion and reason are true but the reason is not the correct explanation of assertion

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Assertion is true but reason is false

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Both the assertion and reason are false

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Reason is true but assertion is false

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Solution

The correct option is D Both the assertion and reason are false
Since the refractive index of air is 1 and the refractive index of water is $\frac{4}{3}$ . Hence the effective refractive of the lens will decrease when dipped in water.

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Assertion: A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length. Reason: The refractive index of water is smaller than the refractive index of air.

The correct option is D Both the assertion and reason are falseSince the refractive index of air is 1 and the refractive index of water is 43. Hence the effective refractive of the lens will decrease when dipped in water.

Assertion: A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length.
Reason: The refractive index of water is smaller than the refractive index of air.

The correct option is D Both the assertion and reason are false
Since the refractive index of air is 1 and the refractive index of water is $\frac{4}{3}$ . Hence the effective refractive of the lens will decrease when dipped in water.