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When a ray of light incident normally upon a plane mirror, will the angle of incidence and the angle of reflection be?

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45 °

0 °

90 °

60 °

answer is B.

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Detailed Solution

When a ray of light is incident normally upon a plane mirror, the angle of incidence and reflection will be

0 °

.
According to the laws of reflection, when a ray of light incidents typically upon a plane mirror, the angle of incidence (

i

) becomes

0 °

, which means the angle of reflection (

r

) too will be equal to

0 °

.
Or,

i = r

And

r = 0 °

Here, when we say a light ray incident, usually, that means the ray incidents perpendicularly on the reflecting surface.

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