Question

Two plane mirrors are inclined at an angle of 45^o with each other. The number of images formed by them when a point sized object is placed on their bisector is :

• A. 5
• B. 7
• C. 6
• D. 8

Answer 1

The correct option is B. 7.

Given,

Angle between the two mirrors = $\theta ={45}^o$

We know that,

The number of images formed by two mirrors inclined at an angle $\theta$ is given by,

$n=\frac{{360}^o}{\theta }-1$ when $\frac{{360}^o}{\theta }$ is odd.

$\Rightarrow n=\frac{{360}^o}{{45}^o}-1=7$

Hence, Seven (7) images will be formed.