Question

Two plane mirrors are kept perpendicular to each other. A light ray strikes the first mirror making an angle of 30 degree with the mirror. With the help of a ray diagram show the path of
the reflected ray till it gets reflected from the second mirror. Also calculate the angle of
reflection for the light ray coming out of the second mirror.

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Answer 1

Explanation:

Answer

Let ray strikes the vertical mirror by angle of incidence θ. Then by joining the perpendiculars of two mirrors it is clear from the diagram that angle of incidence at horizontal mirror is (90−θ).

∴ reflected ray from horizontal mirror makes angle θ with the horizontal mirror also incident ray at vertical mirror makes angle θ with horizontal axis.

∴ reflected ray is parallel to the original ray.

This is true for two perpendicular mirrors fixed at any positions.