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Question: A convex mirror of focal length 10 *cm* is placed in water. The refractive index of water is 4/3. Wh...

A convex mirror of focal length 10 cm is placed in water. The refractive index of water is 4/3. What will be the focal length of the mirror in water

A

10 cm

B

40/3 cm

C

30/4 cm

D

None of these

Answer

10 cm

Explanation

Solution

No change in focal length, because f depends only upon radius of curvature R.