Question

What is the angle of incidence of a ray of light if the reflected ray is at an angle of 90° to the incident ray?
Chapter-Light

Answer 1

an angle of 90 degree with that of the reflected ray, so the incident ray is making an angle 90/2 degree with the normal i.e the angle of incidence is 45 degree(the normal bisects the angle between the incident ray and the reflected ray of light


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Answer 2

If the reflected ray is at the angle of 90o to the incident ray, then the angle of incidence is 45o. According to the law of reflection, the angle of incidence and the angle of reflection are equal. Therefore, the angle of incidence and the angle of reflection both are 90/2=45o.