What is the angle of incidence if the angle between the incidence ray and reflected ray is 90?

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Answer :

If the reflected ray is at the angle of 90 degrees to the incident ray, then the angle of incidence is 45 degrees. 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 equal to

90/2 = 45 degrees.