State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).

What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 30 cm ?

What is the nature of image formed by a concave mirror if the magnification produced by the mirror is

(a) + 4, and (b) - 2 ?

Write the mirror formula. Give the meaning of each symbol which occurs in it.

What is the ratio of the height of an image to the height of an object known as ?