Question

Two plane mirrors $M_1$ and $M_2$ are inclined at angle as shown in fig. A ray of light $1$, which is parallel $M_1$, strikes $M_2$ and after two reflections, ray 2 becomes parallel to $M_2$ Find the angle $\theta$

• A. $30$
• B. $45$
• C. $60$
• D. $37$

Answer 1

The correct option is C $60$

Different angles are as shown in fig$.$ in triangle $ABC,$

$\begin{array}{c}\theta +\theta +\theta ={180}^0\\ 3\theta ={180}^0\\ \theta ={60}^0\end{array}$

Hence,

option $\left(C\right)$ is correct answer.