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In the figure, an object is placed at di...

In the figure, an object is placed at distance `25 cm` from the surface of a convex mirror, and a plane mirror is set so that image formed by the two mirrors lie adjacent to each other in the same plane. The plane mirror is placed at `20 cm` from the object. What is the radius of curvature of the convex mirror ?
.

A

`R = 80 cm`

B

`R = 25 cm`

C

`R = 75 cm`

D

None of these

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