A Ray is Incident on a Plane Mirror . Its Reflected Ray is Perpandicular to the Incident Ray . Find the Angle of Incidence .

A ray is incident on a plane mirror . Its reflected ray is perpandicular to the incident ray . Find the angle of incidence .

Sum

Angle of incidence (i) + Angle of reflection(r) = 90^o

But, as per the laws of reflection, i = r

Therefore, 2 i = 90^o

Or, i = r = 45^o

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Chapter 7 Reflection of Light
Exercise 7 (A) | Q 1 | Page 154

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