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

question 54

Multiple Choice

Two mirrors are joined together along a common side,the planes of the mirrors separated by the angle θ.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 θ?

• A)30°
• B)45°
• C)90°
• D)135°

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