(a) What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror?
(b) Draw diagram to show the action of convex mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the convex mirror.

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Solution

(a) Definitions-
(i) Principal focus (F) of a convex mirror - Focus is the point at which the incident rays, parallel to the principal axis, appear to have come from, after reflection.
(i)Focal length (f) - Focal length of a convex mirror may be defined as the distance between its pole and focus.

(b)Ray Diagram-

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