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The angle between the incident ray and reflected ray is known as angle of deviation due to reflection. This will always be equal to 2i. Here i is the angle of incidence.

So if 2i = 90 then i = 90/2 = 45

So the angle of incidence has to be 45 deg

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Q: What is the angle of incidence of a ray if the reflected ray is at an angle of 90 to the incident ray?
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