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Two plane mirrors are inclined at an ang...

Two plane mirrors are inclined at an angle of `60^@` as shown in Figure. A ray of light parallel to `M_(1)` strikes `M_(2)`. At what angle will the ray finally emerge?

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The angle that the ray makes after each reflection is clearly labeled in the following figure. It is clear that final ray makes an angle of `60^@` with the horizontal, or in other words it emerges parallel to mirror 1.
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