Question

The number of images formed when two plane mirrors are placed at an angle of ${36}^{\circ }$ is:

• A. 6
• B. 7
• C. 8
• D. 9

Answer 1

The correct option is D 9

We know, number of images formed $n=\left(\frac{{360}^{\circ }}{\Theta }\right)-1$.
where,
$\Theta$ is the angle at which the mirrors are placed.
Given, $\Theta ={36}^{\circ }$
$\therefore ,n=\left(\frac{{360}^{\circ }}{{36}^{\circ }}\right)-1$ = 10 - 1 = 9
Hence 9 images are formed.