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One of the unique properties of holograms is that the size of the viewed image scales with the wavelength of the viewing light. Examine a hologram with mercury light to see that scaling. The mercury source has three prominent wavelengths and you can see three distinct images of different size. The use of an interference filter allows you to examine just one of the images at a time. At left are images made through filters at two of the three mercury wavelengths These images are of the larger holographic image.
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