Circular waves radiate out from two point sources creating an interference pattern as they superimpose on each other. The waves sum together producing higher peaks and deeper toughs at some points, whilst cancelling each other out at other points.
Illustration ID: Two_Wave_Sources_Interfering_2
Russell Kightley
Illustration size: 25.0 Mpixels (71.5 MB uncompressed) - 5000x5000 pixels (16.7x16.7 in / 42.3x42.3 cm at 300 ppi)