Two plane mirror are inclined to each other at some angle .a ray of light incident at 30°on one ,after reflection from the other retraces its path .the angle between the mirror.
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On second mirror ray of light retraces its path
⇒ ray of light falls normally on the second mirror
i.e., b=90
a=90−r
1
=60
θ=180−(b+a)
=30°
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