State the direction of incident ray which after reflection from a spherical mirror retraces it's path. Give a reason to your answer.

What is meant by magnification? Write it's expression. What is it's sign for the (a) real (b) virtual, image?

How will you distinguish between a plane mirror, a concave mirror and a convex mirror, without touching them?

Upto what maximum distance from a concave mirror, the image can be obtained? What will be the location of object for it?