The alternate reinforcement and cancellation of two or more wave motions, such as when two beams of light from the same source interact. If the waves in the two beams go up and come down together, they reinforce each other, and the intensity of a combined light beam is increased. The two beams are said to be in phase. But if the two light beams are mixed so that the "ups" of one coincide with the "downs" of the other (i.e., they are out of phase), the ups and downs will cancel out, and darkness results. When waves reinforce, it is called constructive interference, and when they cancel out, it is called destructive interference.
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