How does coherent light differ from ordinary or incoherent light.?

Question

How does coherent light differ from ordinary or incoherent light.?

Answer 1

All waves are in the same phase and each wave stimulates the succeeding wave intensifying it.

Answer 2

Ordinary light (from the Sun, from light bulbs, etc) which consists mainly of light waves of many different wavelengths (colours). What light there is of the same wavelengths tends to be out of phase as well. Versus coherent light, which can only by produced by lasers.

Laser light, unlike ordinary light, is unique in that it usually consists of only a single color of light. The wavelengths of this single color, while not perfectly uniform in length, occur within a very narrow range

Answer 3

in coherent light the phase of all the light rays is same or differs by a constant phase angle.

whereas in ordinary light the phase angle of rays are random.

eg: of coherent light is laser

and that of ordinary light is a bulb in your home