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Selina Solutions Class 9 Physics Solutions for Exercise 7A in Chapter 7 - Chapter 7 Reflection Of Light
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A ray is an incident on a plane mirror. Its reflected ray is perpendicular to the incident ray.
Find the angle of incidence
Answer:
Given: reflected ray is perpendicular to incident ray
That is to say, i + r = 90°
We know from the law of reflection that i=r (angle of incidence = angle of reflection)
i+i=90° => 2i=90°
i=r=45°
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