Haidinger brushes

(redirected from Haidinger, Wilhelm von)
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Haidinger brushes

[′hī·diŋ·ər ‚brəsh·əz]
(optics)
Faint yellow, brushlike patterns that are observed when a bright surface is viewed through a polarizer such as a rotating Nicol prism or sheet of Polaroid film; believed to be caused by birefringence of fibers at the fovea of the eye.
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