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The high dispersion is beneficial in the use of rutile as a white pigment because it increases the selectivity of the optical scattering by the pigment and this partially compensates for the absorption in the violet. The strong absorption in this region had been shown by reflection from rutile pigment but never so strikingly as this demonstration of its failure to pass through even the thin edge area of the prism. It is this strong absorption in the violet that gives the pale yellow color to a massive piece of rutile and the yel- _ lowish undertone to rutile pigments. A piece of Iceland spar, C, is inserted between the two slits and oriented so that the two images of the horizontal slit are located one above the other with the light in one image polarized vertically and the light in the other image polarized horizontally. ллÁË |
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