?Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30°angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2. The angle of reflection of that ray from mirror 2 is
A. ?0°.
B. 30°.
C. ?60°.
D. ?90°.
E. ?120°.
Answer: B
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