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

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

If the magnification of a body of size 1 m is 4, what is the size of the image ?

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 ?

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

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