Two plane mirrors are placed at right angles to
each other. A ray strikes one mirror at an angle of
incidence such that it is also reflected from the
second mirror. Then, the ray reflected from the sec-
ond mirror will be
first
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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.
Explanation:
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