In a convex spherical mirror, reflection of light takes place at:

What is meant by?

(i) principal focus of a convex mirror, and

(ii) Focal length of a convex mirror?

Draw diagram to show the action of convex mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, center of curvature C, pole P and focal length f, of the convex mirror.

A diverging mirrors:

If R is the radius of curvature of a spherical mirror and f is its focal length, then: