The two rays that form an angle are called the legs or sides of the angle.
The meeting point of the two rays that form an angle is called the vertex.
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It is called an arm of the angle.
It is called a "side" (in polygons, these may be called edges, but this can cause confusion with the term as used in 3-dimensional solids).
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
Angle of Incidence = Angle of ReflectionThis is only true if the angle of incidence is greaterthan the critical angle.
The angle between the incident ray and reflected ray is known as angle of deviation due to reflection. This will always be equal to 2i. Here i is the angle of incidence. So if 2i = 90 then i = 90/2 = 45 So the angle of incidence has to be 45 deg