two plane mirrors are inclined to each other at some angle .a ray of light is incident on one of them at an angle of 35 degree .The light after reflection falls on second mirror and gets reversed.find 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)
=35DEGRESS
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