Question

The radius of curvature of a spherical mirror is 40 cm. What is its focal length ?​

Answer 1

Answer:

The focal length of the given spherical mirror is 20cm.

Explaination:

Given-

Radius of curvature,

R = 40 cm

Radius of curvature of a spherical mirror

= > 2 x focal length(f)

=> R = 2f

=> f = R/2

=> f = 40/2

=> f = 20cm.

Hence, the focal length of the given spherical mirror is 20cm