27. Convex mirrors are used as a rear view mirror in motor cycles because :

(A) it forms real image
(B) it forms erect (upright) image
(C) it forms smaller image as compared with object
(D) All the above

Ans. ? (B) & (C) Both are right but (A) is not as it forms virtual image.

A convex mirror will diverge a beam of light and it gives a virtual image. The focal length and radius of curvature of a convex mirror are virtual. The image produced is always up the right way and smaller than the object, the convex mirror gives a wide field of view because of this.