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Q.

When a ray of light falls normally on a plane mirror. What will be the angle of incidence?

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a

50 °

b

40 °

c

90 °

d

0 °  

answer is C.

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Detailed Solution

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When a ray of light falls normally on a plane mirror then the angle of incidence will be 0 °.
Angle of incidence is the term used to describe the angle formed by the incident ray and the normal. The reflected ray will be along the same line as the incident ray but in the opposite direction. When the ray of light falls normally on a plane mirror, the angle of incidence is equal to the normal. Hence, the incidence angle is 0 °.
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