Two plane mirrors are inclined at angle theta is 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 is shown in figure. IF a

1.	Two plane mirrors are inclined at angle theta is 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
Answer» `90^@` `60^@` `45^@` `30^@` ANSWER :B