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(A) : A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will still have the same focal length.
(R) : The refractive index of air is greater than the refractive index of water.

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Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

'A' is true and 'R' is false

Both 'A' and ‘R’ are false

answer is D.

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Detailed Solution

focal length of a mirror does not depend on the medium but focal length of the lens depends on the medium in which it is used. Hence focal length of the mirror will not change but the focal length of the lens will change when placed in water.

Water is optically denser than air. Refractive index of water is more than that of air.

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