| 单词 | object mirror |
| 释义 | > as lemmasobject mirror object mirror n. Astronomy (now rare) = primary mirror n. at primary adj. and n. Compounds (cf. earlier object-speculum n.). ΚΠ 1754 Philos. Trans. 1753 (Royal Soc.) 48 177 After the same manner may the double object mirror of a reflecting telescope for this use be proved. 1853 W. T. Brande Dict. Sci., Lit. & Art 1229/1 In reflecting telescopes the speculum, or mirror, performs the same office that the object-glass does in those of the refracting kind, and is therefore called the object-mirror. 1940–1 Notes & Rec. Royal Soc. 3 24 For technical reasons the requisite parabolic object-mirror could not be satisfactorily made. < as lemmas |
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