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Question
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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Solution
If the reflected ray is at an angle of 90° to the incident ray, then the angle of incidence is 45°. According to the law of reflection, the angle of incidence is equal to the angle of reflection.
Therefore, the angle of incidence and the angle of reflection both are `90^@/2` = 45°
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