A laser beam is incident on the left mirror in the figure below, in which α = 85°. Its initial direction is parallel to a line that bisects the mirrors. What is the angle ϕ of the reflected laser beam?
The law of reflection, where the angle of incidence (measured from the normal, the line perpendicular to the surface) is equal to the angle of reflection
The Attempt at a Solution
I tried assigning names to all the angles and figuring out which were equal to each other, then trying to do it algebraically. But I don't see any way to do this with only the one angle given...
Last edited by a moderator: