Question: A light beam is incident upon a mirror that is held horizontally. The angle that the light beam makes with the normal line is 50.

A light beam is incident upon a mirror that is held horizontally. The angle that the light beam makes with the normal line is 50°. But then, the mirror is tilted at an angle of 30° above the horizontal without changing the direction of the light beam. What is the angle of incidence in degrees? Oi Or 30°

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