Question

What is meant by magnification? Write its expression. What is its sign for the a) real image b) virtual image

Answer 1

Magnification of a mirror can be defined as the ratio of height of image by height of object.
i. e., Height of image / height of object.

a. If image is real this means it must be inverted also hence, for this case magnification will of negative.

b. If image formed by mirror is virtual then the image will be erect hence, magnification sign will be of positive.

Answer 2

answer : magnification of mirror is the ratio of height of image upon height of object

expression:. height of image/height of object

1. sign will be negative
2. sign will be positive