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


Assuming angles between two mirrors be $\theta$ as per geometry, sum of anlges of $\Delta$
$3 \theta = 180^{\circ}$
$\theta = 60^{\circ}$

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