Correct Answer: Option C

Explanation

Concave Mirror: It is a spherical mirror whose outer surface is polished and inner or concave side is reflecting surface.

Convex Mirror: It is a spherical mirror whose inner surface is polished and outer side or convex side is the reflecting surface.

f = \(\frac{m}{4}\) = f = \(\frac{d}{4}\)

f = \(\frac{20}{4}\) = 5cm

There is an explanation video available below.

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