Question

To get 9 multiple images the angle between the plane mirrors should be:

• A. ${60}^{\circ }$
• B. ${36}^{\circ }$
• C. ${45}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is B ${36}^{\circ }$

Number of images formed by plane mirror is given by
$n=\frac{360}{\theta }-1$
$9=\frac{360}{\theta }-1$
$\theta =\frac{360}{10}={36}^0$