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Q.

Is it true that the light ray retraces its path when it falls on the plane mirror normally?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
"According to the law of reflection, the angle of incidence is equal to the angle of reflection, and also, the incident, reflected, and normal all lie on the same plane."
When a light ray falls on the plane mirror normally, then the angle of incidence and angle of reflection are right angles, and therefore the light ray retraces its path.
 
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