A ray of light is incident at 50° on the middle ofone of the
two mirrors arranged at an angle of 60° between them. The
r

A ray of light is incident at 50° on the middle ofone of the
two mirrors arranged at an angle of 60° between them. The
ray then touches the second mirror, get reflected back to
the first mirror, making an angle of incidence of
(a) 50 (b) 60
(c) 70 (d) 80​

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