The angle of incidence and reflection are reference to of a line normal or perpendicular to a surface. The incidence angle is the incoming ray angle relative to the normal line and the reflection is the outgoing angle relative to the normal line. Both angles are in the plane containing the normal line and the incidence ray.
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The angle of incidence
The angle of incidence is ALWAYS equal to the angle of reflection! This is one of the laws of reflection.
0(zero) Angle of incidence = angle of reflection
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
For a smooth surface, the angle of incidence is the same as the angle of reflection.