A ray of light bounces between 3 mirrors as in figure. Mirror B is at 120 ∘ to Mirror A, and Mirror C is 100∘ to Mirror B. The light ray emerging from Mirror C is parallel to Mirror A. What is the angle of incidence at Mirror A (in degrees)?
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Explanation:
On plotting the ray diagram, we get by geometry the angle of reflection for the ray reflected from mirror B = 65
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.
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