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crossed cylinder |
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crossed cylinder [¦krȯst ′sil·ən·dər] (optics) A thin lens whose surfaces are portions of circular cylinders whose axes cross at right angles or obliquely. A weak lens whose effect is equivalent to that of lenses with convex and concave cylindrical surfaces of equal curvature crossed at right angles. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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