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Question

A light ray is incident on a flat surface, making an angle of 20 with the surface. Find (i) the angle between the incident ray and the reflected ray (ii) the angle between the reflected ray and the surface?

A
70, 20
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B
70, 70
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C
140, 20
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D
20, 70
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Solution

The correct option is C 140, 20
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=9020=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
Hence, the angle between the incident ray and the reflected ray is i+r=70+70=140
The angle between the reflected ray and the surface is:
90r=9070=20

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