Question

Two mirrors are inclined at an angle $\theta$. For an object placed in front of them, $11$ images are noticed. Find the angle between the mirrors.

• A. ${30}^{\circ }$
• B. ${32.8}^{\circ }$
• C. ${16.4}^{\circ }$
• D. ${15}^{\circ }$

Answer 1

The correct option is A ${30}^{\circ }$

Number of images
$N=\frac{{360}^{\circ }}{\theta }-1\Rightarrow 11=\frac{{360}^{\circ }}{\theta }-1\Rightarrow \theta ={30}^{\circ }$