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Two verticle plane mirrors are inclined at an angle of 60 with each other. A ray of light travelling horizontally is reflected first from one mirror and

the other. The resultant deviation is
1)60. 2) 120. 3)180 4)240


The incident angle is not given.  So the answer doesn't depend on the incident angle as long as the reflected ray from first mirror can become the incident ray for second mirror.

See the diagrams. The answer is (2) 120 degree.
2 4 2
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