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A horizontal ray hitting a prism with n=1.5, tip angle α=4o. The ray will be deflected by an angle δ=(n-1)α. The ray is further reflected by a vertical mirror. Now, if I want to make the final ray becomes horizontal again, how many degree (and in what direction) should I turn the mirror?
Sol: The incident angle is 45 because the angle of reflection and angle of incident is equal.
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