Question

If the angle of incidence, θi = 0°, the angle of reflection, θr = ________.

Answer 1

Answer:

In a plane mirror, angle of incidence is equal to the angle of reflection.

Therefore angle of reflection = 0°

Answer 2

Explanation:

If the incident ray falls along the normal, the angle of incidence is 0 degrees, NOT 90 degrees. The angle is measured with the normal to the mirror and not with the plane of the mirror. Hence the angle of reflection is equal to 0 degrees.

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