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  4. Two plane mirrors arc inclined to each other such that a ray of light incident on the first mirror (M1) and parallel to the second mirror (M2) is finally reflected from the second mirror (M2) parallel to the first mirror (M1). The angle between the two mirrors will be :

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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 :

JEE MainJEE Main 2019Ray Optics and Optical Instruments

Solution:

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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