In terms of `theta` find the value of i, show that ray of light retraces its path after third reflection

In the shown figure, mirror is rotated by an angle theta. Find theta if ray of light retraces its path after reflection from M ray of light MP turns in the direction of MN.

In the shown figure, mirror is rotated by an angle theta. Find theta if ray of light retraces its path after reflection from M ray of light MP turns in the direction of MN.

Two plane mirrors are inclined to each other at a certain angle.A ray of light first incident on one of them at an inclination of 10^(@) with the mirror retraces its path after five reflections.The angle between the mirrors is

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

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

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

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) The graph between theta and n will

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) The graph between theta and n will