A ray undergoes successive reflections from two plane mirrors that are perpendicular to each other. The ray lies in the plane perpendicular to the mirrors' line of intersection. Which statements are correct?
Select all that apply

Question

A ray undergoes successive reflections from two plane mirrors that are perpendicular to each other. The ray lies in the plane perpendicular to the mirrors' line of intersection. Which statements are correct?

Select all that apply

G1 Physics · Accepted Answer

The composition of reflections in two lines meeting at 90° is a rotation through twice that angle, i.e. 180°. Thus the final propagation direction is opposite to the initial one.