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

According to New Cartesian Sign Convention:

One of the following does not apply to a concave mirror. This is:

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 ?