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How does interference work for white light?

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Because white light has a wide range of wavelengths, interference is undefined. Interference is only significant for one wavelength, or a relatively narrow range of waveengths in the light. With the wide range, for any place where one wavelength would cancel (or add) there woule be another color that would have significant intensity (or nine). read more

White light is a mix of frequencies, and while interference happens, the different colours give different patterns, and you really don't see too much of a difference, unless the white light is actually composed of a string of harmonics of a given wavelength. read more

Above: White light Interferogram, Below: Red-, Green- and Blue channels of the White light interferogram shown above As described here, white light interferometry is a non-contact optical method for surface height measurement on 3-D structures with surface profiles varying between tens of nanometers and a few centimeters. read more

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