Question

A ray of light is incident normally on a plane mirror. What is the angle of incidence and angle of reflection ?

2. Why does a geostationary satellite appear stationary ?

Answer 1

1. angle of incidence is always equal to angle og reflection.
I.e., angle i = angle r

Answer 2

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The Second Law of Reflection states that the angle of incidence is always equal to the angle of reflection. Therefore, the angle of reflection is same as the angle of incidence, that is, 00. So, the reflected ray will retrace the path of the incident ray.