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Question
When a ray of light strikes a plane mirror at an angle of 150 with the mirror, what will be the angle through which the ray will deviate? Illustrate with a ray diagram in the following figure.
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Solution
Reflection obeys the following two laws.
a. The incident ray, the reflected ray, and the normal at the point of incidence, all lie in the same plane.
b. The angle of incidence and the angle of reflection are always equal. According to these two laws, this ray will deviate like this:
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