Constructive Interference:Two or more crests (or two or more troughs) move towards each other and, when they meet, the resulting wave appears with a amplitude equal to the sum of the amplitudes of the crests/troughs.

Destructive Interference:A crest and a trough of identical amplitudes and wavelengths are moved towards one another, when they meet, they cancel each other, out of phase and continue in their movement.

 

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