Constructive interference is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction. This type of interference is sometimes called constructive interference. The individual sine pulses are drawn in red and blue and the resulting displacement of the medium is drawn in green. The diagrams below depict the before and during interference snapshots of the medium for two such pulses. At that moment, the resulting shape of the medium would be an upward displaced sine pulse with an amplitude of 2 units. As the sine pulses move towards each other, there will eventually be a moment in time when they are completely overlapped. Let's suppose that each displaced upward 1 unit at its crest and has the shape of a sine wave. To begin our exploration of wave interference, consider two pulses of the same amplitude traveling in different directions along the same medium. The interference of waves causes the medium to take on a shape that results from the net effect of the two individual waves upon the particles of the medium. Wave interference is the phenomenon that occurs when two waves meet while traveling along the same medium. What happens when two waves meet while they travel through the same medium? What effect will the meeting of the waves have upon the appearance of the medium? Will the two waves bounce off each other upon meeting (much like two billiard balls would) or will the two waves pass through each other? These questions involving the meeting of two or more waves along the same medium pertain to the topic of wave interference.
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