When two plane mirrors subtend an angle `theta` between them, then a ray of light incident parallel to one of them retraces its path afer n reflections such that `ntheta=c` (where c is constant)
If the angle between mirrors is `60^(@)` . Then light ray retraces its path after n reflections where n is
A. 3
B. 4
C. 2
D. None of these
