Two Mirrors Are Joined Together Along a Common Side, the Planes

question 41

Multiple Choice

Two mirrors are joined together along a common side, the planes of the mirrors separated by the angle $\theta$ . If the joined mirrors can be used as a retroreflector when a beam of light strikes both surfaces (one after the other) , what is the value of $\theta$ ?

• A) 90°
• B) 135°
• C) 45°
• D) 30°

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