What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?
What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?
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As per the laws of reflection
The angle of incidence ∠i = angle of reflection ∠r
Here as given ∠i + ∠r = 90°
∴ ∠i + ∠i = 90 °
or ∠i = 90/2 = 45 °
Hence angle of incidence of a ray = 45 degree
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