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Question

A light ray is incident on a flat surface, making an angle of 20 with the surface. What is the angle of incidence and angle of reflection respectively?


Your Answer
A
20,20
Your Answer
B
20,70
Correct Answer
C
70,70
Your Answer
D
70,20

Solution

The correct option is B 70,70
Let the angle of incidence and angle of reflection be i and r respectively
Since the angle between the surface and normal is 90
∴ ∠ i + 20 = 90
⇒ ∠ i = 90 - 20 = 70

We know that the law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

⇒ ∠ i =  ∠ r = 70

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