#### Question

The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

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#### Solution

Radius of curvature, *R*= 20 cm

Radius of curvature of a spherical mirror = 2 × Focal length (*f*)*R*= 2*f**f*= *R*/2 = 20 / 2 = 10

Hence, the focal length of the given spherical mirror is 10 cm.

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Solution for question: The radius of curvature of a spherical mirror is 20 cm. What is its focal length? concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror. For the course CBSE