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

question 77

Multiple Choice

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

• A)30 \(\degree\)
• B)45 \(\degree\)
• C)90 \(\degree\)
• D)135 \(\degree\)

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