Specular reflection

To understand what specular reflection is, let's quickly go over some basic terms. The ray of light that strikes a surface is called an incident ray, and the angle between this ray and the perpendicular or normal to a surface is the angle of incidence. The reflected ray is the ray reflected by the surface, and the angle between the surface normal and the reflected ray is called the angle of reflection. When the angle of reflection equals the angle of incidence, we have a specular reflection. Think of mirrors or still lake water.