Question: Two vertical plane mirrors are inclined at an angle of 60 Degree with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is
(a) 60 Degree
(b) 120 Degree
(c) 180 Degree
(d) 240 Degree
Answer : (d) δ=(360 - 2θ) = (360 - 2*60) = 240 Degree
