Two Flat Rectangular Mirrors Are Set Edge to Edge and Placed

question 14

Multiple Choice

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 θM₁ then strikes the second mirror and reflects at θM₂ 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°.

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