Question

15. What is the angle of reflection when a ray of light falls normally on a mirror?
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Answer 1

If a ray falls normally, then it reflects back along the same direction. Hence, angle of reflection is zero

Answer 2

Answer:

When a ray of light falls normally (or perpendicular) on the surface of a plane mirror, it means that angle of incidence is 0o. According to second law of reflection, angle of incidence is equal to the angle of reflection. ... Thus, the light ray will be reflected back along the same path.