Assertion :The radius of curvature of a mirror is double of the focal length. Reason: A concave mirror of focal length f in air is used in a medium of refractive index 2. Then the focal length of mirror in medium becomes 2 f.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Focal length of a mirror does not depend on the medium in which mirror is held. It depend on the radius of the sphere from which it is made. However focal length of a lens does depend on medium

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Choose the correct option based on it.

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Assertion :The radius of curvature of a mirror is double of the focal length. Reason: A concave mirror of focal length f in air is used in a medium of refractive index 2. Then the focal length of mirror in medium becomes 2 f.

The correct option is C Assertion is correct but Reason is incorrectFocal length of a mirror does not depend on the medium in which mirror is held. It depend on the radius of the sphere from which it is made. However focal length of a lens does depend on medium

The correct option is C Assertion is correct but Reason is incorrect
Focal length of a mirror does not depend on the medium in which mirror is held. It depend on the radius of the sphere from which it is made. However focal length of a lens does depend on medium