Question

What is the magnification of a plane mirror?

• A. $1$
• B. $0$
• C. $2$
• D. $-1$

Answer 1

The correct option is A

$1$

A plane mirror forms a virtual erect image of the same size as that of the object. In other words, image size $\left(h_i\right)$ equals the object size $\left(h_o\right)$.

$h_i=h_o$

Magnification is given by:
$m=\frac{h_i}{h_o}=1$