![]() In ideal mediums (water, air are almost ideal) energy is always conserved, at points of destructive interference energy is stored in the elasticity of the medium. ![]() If a crest of one wave meets a trough of another wave, then the amplitude is equal to the difference in the individual amplitudes-this is known as destructive interference. If a crest of a wave meets a crest of another wave of the same frequency at the same point, then the amplitude is the sum of the individual amplitudes-this is constructive interference. ![]() The principle of superposition of waves states that when two or more propagating waves of the same type are incident on the same point, the resultant amplitude at that point is equal to the vector sum of the amplitudes of the individual waves. Cropped tomography scan animation of laser light interference passing through two pinholes (side edges).
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