The
word incoherent is typically used to describe a form of
light in which the actual light
waves are "scattered". An example of an incoherent light is the common
desklamp. An example of coherent light is a
laser beam.
The
typical effects of light being coherent is that it stays the same
diameter as the focal point,
virtually
forever.
Incoherent is also sometimes used to describe a
moron, or an
intoxicated person. This is usually
indicated by a pattern of unrecognizeable
speech.