Talk:Pleochroism
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Question: if double refraction splits into 2 beams at 90° angles polarized, and this leads to the dichroic effect; are trichroic stones split into 3 beams at what angles?
I wonder if you misunderstood. I think the author meant the two orthagonal (ie perpendicular, 90°) polarization states see different refractive indicies and thereby split into two paths. For a given wavelength, you should only be able to split it in two.