RRB ALP 9th Aug 2018 shift-1 Question 15

Question 15

A convex mirror of focal length f (in air) is immersed in a liquid ($$\mu=\frac{4}{3}$$). The focal length of the mirror in liquid will be:

Solution

The focal length of the mirror in liquid will be equal to f because focal length of a convex mirror does not depend upon the refractive index of the liquid.

Therefore, Option A is correct.

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