ERICH SCHREMPP / SCIENCE PHOTO LIBRARY ERICH SCHREMPP / SCIENCE PHOTO LIBRARY
Waves rebounding off a barrier. Circular waves (at centre) spread outwards from a point source, before striking a barrier (lower frame, dark blue). The reflected waves which rebound off the barrier form a semi-cirle (at bottom) that fans out as radiating secondary waves. An interference pattern can be seen between the primary and secondary waves.
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