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Q. Two plane mirrors $M _1$ and $M_2$ are inclined at angle $\theta$ as shown in the figure.
image
A ray of light $1$, 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

Ray Optics and Optical Instruments

Solution:

Different angles are as shown in figure.
image
In triangle $ABC$,
$ \theta + \theta+ \theta = 180^{\circ}$,
$ \theta = 60^{\circ}$