the angle of incidence is the angle measured between the normal and the incident ray.. the angle of reflection is the angle measured between the reflected ray and the normal..
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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.
When talking about reflection (normally with light), one works out the angle of incidence and the angle of reflection by drawing a line that is perpendicular (90 degrees) to the reflector and measuring the angle between this line and the ray of incidence/reflection. This line is called the normal line. It is easier to measure the angles of incidence and reflection on a flat surface, because it is easier to draw an accurate normal line.
No. The refractive index is an absolute measure that determines by how much the angle of incidence is different from the angle of reflection.
0(zero) Angle of incidence = angle of reflection