Define the principle of superposition of wave. State the conditions of permanent Interference of light.
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⭐Principle of superposition states that when two or more waves meet at a point, the resultant wave has a displacement which is the algebraic sum of the displacements of each wave.⭐
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The principle of superposition of waves states that when two or more propagating waves of 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. If 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 contractive interference. 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 destractive inference.
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