?Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle?M1 then strikes the second mirror and reflects at?M 2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
A. ?0°.
B. ?45°.
C. ?90°.
D. ?150°.
E. ?235°.
Answer: C
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