If a parallel beam of light is incident on spherical mirrors then after reflection they pass through focal point. If F is the focal length and R is the radius of curvature of mirror then

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TestHub · Accepted Answer

For a spherical mirror, the focal length $F$ is defined as the distance from the pole of the mirror to the principal focus.

For paraxial rays (rays close to the principal axis), the relationship between the focal length $F$ and the radius of curvature $R$ is given by $F = \frac{R}{2}$ .

Rearranging this relation, we get $R = 2 F$ .

Answer: $R = 2 F$

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