Grade 12th pass8 grade science
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?
1 Answer
Pawan Prajapati
Here, the angle of reflection is 90°. As we know, according to the laws of reflection that angle of incidence is equal to angle of reflection.
Here, the angle between the incident ray and reflected ray is 90°.
i.e., ∠i + ∠r = 90°
Since, ∠i = ∠r
We can write, ∠i + ∠i = 90°
⇒ 2∠i = 90°
⇒ ∠i = 45°
Angle of incidence = 45°.
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