Two plane mirror A and B are inclined at angle $\theta (<{90}^o)$ to each other. A light ray parallel to mirror B is incident on mirror A and it becomes parallel to mirror A after reflection from mirror B. Find the value of angle $\theta$.

Q. Two plane mirrors are inclined at ${70}^{\circ }.$ A ray incident on one mirror at incidence angle $\theta$ , after reflection falls on the second mirror and is reflected from there parallel to the first mirror. The value of $\theta$ is

Q. Two plane mirrors are inclined at ${70}^o$. A ray incident on one mirror at angle $\theta$, after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $\theta$ :

Q. Two plane mirror A and B are oriented perpendicular to each other. A light ray incident at angle $\theta$ on mirror A is also reflected by the mirror B. If the reflected ray from mirror B is parallel to the incident ray on A, such that the ray reflected from the first mirror as the same angle of incidence on the second mirror then find the value of $\theta$.

Q. Two plane mirror are arranged at right angles to each other as shown in figure .A ray of light is incident on the horizontal mirror at an angle of $\theta$.For what value of $\theta$ the ray emerges parallel to the incoming ray after reflection from the vertical mirror?

Q. There are two plane mirrors placed at some angle $\theta$ with each other. A ray incident on first mirror (travelling parallel to second mirror) , travels parallel to the first mirror after two successive reflections. Find the angle $\theta$ between the mirrors.