Noun
the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence
Source: WordNetBut the angle of incidence equals the angle of reflection so the angle between the object ray and the normal must also increase by 20°. Source: Internet
The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). Source: Internet
The laws of reflection state that the angle of reflection is equal and opposite to the angle of incidence between the incident ray and the normal to the sphere. Source: Internet
This is due to viewing angle (less than the critical angle of reflection of the black vinyl) and the path of the light being reflected due to this being changed by the grooves, leaving a rainbow relief pattern behind. Source: Internet