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07-05-2020
Physics

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You are asked to design a retroreflector using two mirrors that will reflect a laser beam by 180 degrees independent of the incident direction of the beam. What should be the angle between the two mirrors?

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07-05-2020

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Consider the diagram. We are effectively being asked to prove that $\alpha=i_1$, for any value of $i_1$. Now, from trigonometry,

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