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Wavelenth o a sine swaw, λ, can be measured atween ony twa pynts wi the same phase, such as atween crests, or troughs, or correspondin zero crossins as shawn.

In pheesics, the swawlenth o a sinusoidal swaw is the spatial period o the wave—the distance ower which the swaw's shape repeats.[1]

References[eedit | eedit soorce]

  1. Hecht, Eugene (1987). Optics (2nd ed.). Addison Wesley. pp. 15–16. ISBN 0-201-11609-X.