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20 July, 10:38

The angle between a flashlight beam that strikes a mirror and the reflected beam is 80 degrees. What is the angle of incidence?

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  1. 20 July, 11:25
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    Since the angle of incidence and reflection are equal and the sum of them span the incident and reflected beam (80 degrees) then the angle of incidence is 40 degrees. This makes the sum of incident and reflected angles (which are the same) 40+40=80
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