| Anomolous polarization colors | Back
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 selfQT.Cuacetate.20x.xpol.mpeg |  Dispersion of extinction produces
anomolous polarization colors for crystals in oblique extinction
orientations. Essentially the oblique angle changes as the stage is rotated,
thus producing different colors when the crystal is viewed under crossed
polars. When you view the copper acetate movie note that on one side of
extinction blue is observed while yellow/green is observed on the other
side. This is especially clear for the large central crystal, but may also
be observed for many of the other crystals. |