Specular reflection is the perfect,
mirror-like
reflection of light (or sometimes other kinds of
wave) from a surface, in which light from a single incoming direction (a ray) is reflected into a single outgoing direction. Such behavior is described by the law of reflection, which states that the direction of incoming light (the incident ray), and the direction of outgoing light reflected (the reflected ray) make the same angle with respect to the
surface normal, thus the angle of incidence equals the angle of reflection; this is commonly stated as .
See more at Wikipedia.org...