| 单词 | roof prism |
| 释义 | > as lemmasroof prism roof prism n. Optics a reflecting prism in which two of the reflecting faces are at a right or (more rarely) acute angle to one another, maintaining correct visual orientation, and typically used in pairs to provide a compact instrument with the eyepiece and objective in line; frequently attributive; cf. Porro prism n. ΚΠ 1904 U.S. Patent 765,607 3/1 Total reflection by unsilvered surfaces at angles of forty-five degrees—as, for example, in the ‘roof-prisms’ sometimes employed. 1955 Sci. News. Let. 17 Sept. 191/2 (advt.) Eye piece is 1″ Kellner and eyepiece assem[bly] has a 90° Roof prism. 1983 Outdoor Life Aug. 44 Lately there's been a great demand for roof prism binoculars because generally the design has been used to produce glasses that are slightly more compact than those using the porro prism design. 2006 Bird Watching Aug. 88/2 Small enough to fit in a pocket but bulkier than a comparable roof-prism model. < as lemmas |
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