When does a ray of light falling on a plane mirror completely retraces its path??
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Answer:
The Ray of light completely retraces it's path when the angle of incidence is 90°
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Explanation:
According to law of reflection of light, the incident ray is always equal to the reflected ray . So, if the ray falls normally on a plane mirror then the incident ray as well as the reflected ray becomes 0o . Therefore , it retraces it path.
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