posted by steph on .
A pair of vertical plane mirrors stands with an angle of β = 56.5 degrees between them. A pencil of light approaches in a direction parallel to one of them, as shown. After the pencil has left the mirrors, in which direction will it be going? (Give your answer as the angle above the second mirror the light hits... NOT as an angle with respect to the normal) Use "deg" as the unit for degrees.