Two plane mirrors are placed at an angle `theta`so that a ray parallel to one mirror gets reflected parallel to second mirror after two consecutive reflections .The value of `theta`will be-

Two plane mirrors are inclined at angle theta as shown in figure. If a ray parallel to OB strikes the other mirror at P and finally emerges parallel to OA after two reflections then theta is equal to

Two plane mirrors are inclined at angle theta as shown in figure. If a ray parallel to OB strikes the other mirror at P and finally emerges parallel to OA after two reflections then theta is equal to

Two plane mirros are inclined at an anle theta . It is found that a ray incident on one mirror at any angle is rendered paralle ot itself after reflection from both the mirrors. The value of theta is