Which statement is true for the image formed by two plane mirrors placed at an angle of 90° to each other?

Let the number of images formed be n

n = $\frac{360}{\mathrm{\theta }}-1$, where $\mathrm{\theta }$ =  90°=the angle between the two mirrors

$\Rightarrow \mathrm{n} = \frac{360}{90}-1$

$\Rightarrow \mathrm{n}=4-1$

$\Rightarrow \mathrm{n} = 3$

When two plane mirrors are placed at a 90° angle to each other, three images are formed due to multiple reflections between the two mirrors.