Question

if the light ray falls normally on a plane mirror then what is the angle of incidence?​

Answer 1

Answer:

0°

Light energy | Short/Long Answer Questions

Q7) A ray of light falls normally on a plane mirror. What is the angle of incidence? Solution : Angle of incidence is 0°.

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Explanation:

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Answer 2

Answer: In such cases, ∠i = 0°.

Explanation: Falling normally means that the incident light ray falls perpendicular to the point of incidence. So, angle between incident ray and normal = 0° (angle of incidence).

More: In such cases, angle of deviation (δ) is always 180°. [∵ δ = 180° - (∠i + ∠r) = 180°.]