Question

A concave mirror has focal length of 20 cm. Calculate its radius of curvature.

Answer 1

Answer:

answer=40

Explanation:

because centre of curvature is two times of focal length

Answer 2

Radius of curvature = 40 cm

Explanation:

Concave mirror is a spherical mirror in which the reflecting surface bulges inwards.

The focal length of a concave mirror is half its radius of curvature.

So we get the formula f = R/2, where R is radius of curvature of the mirror and f is the focal length.

Given focal length is 20 cm, let's find out radius of curvature.

F = 20 = R/2

So R = 2 * F = 2 * 20 = 40 cm