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Waves from two sources travel in a medium. At some points when they interfere simultaneously crest and trough of the two waves would meet. So the displacement at that point would be reduced. Hence it is termed as Destructive Interference.

If, otherwise, both crests or toughs of the two waves interfere then displacement at those points would be added and hence it becomes maximum. This is termed as Constructive Interference

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What is another name for destructive interference?

Another name for destructive interference is "negative interference."


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