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The wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and the inverse of the spatial frequency or wavenumber. Determined by considering the distance between consecutive corresponding points of the same phase, such as crests. Use for wavenumber, wavelength, frequency.

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Double-slit experiment with two different mediums

Only the wavelength of the light matters. The medium after the slits affects the spacing of the fringes, but qualitatively there is no difference with different media. …
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