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Crookes lens

noun

  1. a type of lens, used in sunglasses, that is made from glass containing cerium. It reduces the transmission of ultraviolet radiation

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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crookesiteCrookes radiometer

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