When two plane mirrors are parallel to each other, the angle between them is degrees.

Q.

In a barber's shop, two plane mirrors are placed :

(a) perpendicular to each other

(b) parallel to each other

(c) at an angle of ${60}^{\circ }$ between them

(d) at an angle of ${45}^{\circ }$ between them.

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.

Q.

The plane mirrors $M_1$ and $M_2$ are inclined to each other such that a ray of light incident on mirror $M_1$ and parallel to the mirror $M_2$ is reflected from mirror $M_2$ parallel to the mirror $M_1$. The angle between the two mirror is (in degrees)

Q. Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror $\left(M_1\right)$ and parallel to the second mirror $\left(M_2\right)$ is finally reflected from the second mirror $\left(M_2\right)$ parallel to the first mirror $\left(M_1\right)$. The angle between the two mirrors will be :

Q. Two plane mirrors are held parallel to each other and at an angle ${45}^{\circ }$ to the line joining them as shown in figure. What will be the angle between incident ray and emergent ray ( ray after reflection from a second mirror) ?