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G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
Abstract
1,265,723. Optical condensers. IMPERIAL CHEMICAL INDUSTRIES Ltd. Jan.29, 1970 [Feb.14, 1969], No. 8172/69. Heading G2J. A condenser system for slide or cine projectors comprises two plano-convex lenses formed of a 4-methyl pentene-1 polymer.