| 单词 | optical flat |
| 释义 | > as lemmasoptical flat f. In full optical flat. A block or lamina (usually of glass) with one or more surfaces made accurately plane and smooth, any unevenness or departure from a perfect plane being small compared with the wavelength of light. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > apparatus > [noun] spectacle-case1597 steel glass1662 dark glasses1733 bruiser1738 hone pavement1738 Ramsden's ghost1807 sunshade1829 optical bank1874 phacometer1876 optical bench1880 flat1897 lens paper1925 light pipe1939 lens tissue1941 optical fibre1960 1897 Astrophysical Jrnl. 5 134 The second..requires two large optical flats, each about one and one-half times the aperture of the telescope itself. 1932 A. C. Hardy & F. H. Perrin Princ. Optics xvi. 345 Round flats are edged exactly like lenses but rectangular ones are edged somewhat differently. 1957 R. S. Longhurst Geom. & Physical Optics viii. 135 If an optical flat is placed in contact with a shallow convex spherical surface, a thin air film of varying thickness results. 1971 Nature 30 Apr. 575/1 Silver chloride sheet..was made as flat as possible by compression between glass optical flats. optical flat optical flat n. a block or lamina (usually of glass) with one or more surfaces made accurately plane and smooth, any unevenness or departure from a perfect plane being small compared with the wavelength of light. ΚΠ 1897 Astrophysical Jrnl. 5 134 The second..requires two large optical flats, each about one and one-half times the aperture of the telescope itself. 1957 R. S. Longhurst Geom. & Physical Optics viii. 135 If an optical flat is placed in contact with a shallow convex spherical surface, a thin air film of varying thickness results. 1992 Science 30 Oct. 784/3 The ends of the sections are ground with diamond compound and final polished to an optical flat. < as lemmas |
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