PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics
Problem
Two light rays meet at point S. Ray SA approaches S in the horizontal plane from due east. Ray SB leaves S making 40∘ with the horizontal toward due north and slightly upward. Can the mirror be oriented so that these two rays can be treated as the incident and reflected rays while still satisfying the first law of reflection?
(a) Yes; but only if the mirror surface is horizontal
(b) Yes; the normal should lie in the plane that contains both rays and bisect the angle between them
(c) No; because the two rays do not lie in a single plane
(d) Yes; but only if the mirror is tilted 20∘ above the horizontal plane