Q.

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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a

45°

b

0°

c

90°

d

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