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Assertion : The radius of curvature of ...

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 2f.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true and reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
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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