Two place mirrors are inclined at an angle by ${120}^o$, as the figure shows. If a ray strikes mirror $M_1$, at a ${65}^o$ angle of incidence, at what angle $\theta$ does it leave mirror $M_2$.

Q. Two plane mirrors are inclined at an angle by ${120}^o$, as the figure shows. If a ray strikes mirror $M_1$$,ata$65^o$angleofincidence,atwhatangle$\theta$doesitleavemirror$M_2$.

Q. Two plane mirror are inclined to one another at an angle of ${60}^o$. A ray is incident on mirror $M_1$ at an angle $i$. The reflected ray from mirror $M_2$ is parallel to mirror $M_1$as shown in figure. The angle of incidence $i$ is:

Q. Two mirrors $M_1$ and $M_2$ are inclined at angle $\theta$ as shown. A ray of light which is parallel to $M_2$ strikes $M_1$ and then strikes mirror $M_2$. After that it retraces its own path. Find $\theta$.

Q. Two planes mirrors are inclined at an $\angle \theta$, find $\theta$ if the incident ray is parallel to mirror $M_1$?

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