A convex mirror of focal length 10 cm is placed in water. The refractive index

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A convex mirror of focal length 10 cm is placed in water. The refractive index of water is $\frac{4}{3}$ . What will be the focal length of the mirror in water

Options:

A . 10 cm

B .

\frac{40}{3} c m

C .

\frac{30}{4} c m

D . None of these

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

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