Question

A concave mirror is half dipped in water. Focal length of portion of mirror is the air is and focal length of mirror in water is , then (Take refractive index of water )

A

B

C

D

Medium
Solution
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Correct option is C)

The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the lows of reflection. So the focal length , remains same in every medium.

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