| 单词 | distinct base |
| 释义 | > as lemmasdistinct base distinct base n. Optics (now historical) a focus, a focal plane. ΘΚΠ the world > physical sensation > sight and vision > [noun] > focal distance distinct base1686 1686 Philos. Trans. (Royal Soc.) 16 170 The Focus of the Object-glass..is usually called the Distinct-Base. 1692 W. Molyneux Dioptrica Nova 37 This F E D we call the Distinct Base, Focus, or Burning Point. 'Tis called the Distinct Base, because therein is a Distinct Representation of the Object. 1707 J. Flamsteed Hist. Life in F. Baily Acc. Revd. John Flamsteed (1835) 32 All the rays of light that fall upon the object parallel to the axes may be collected into one point of the image in the distinct base. 1709 G. Berkeley Ess. New Theory of Vision §40. 43 The Distance of the Distinct Base behind the Eye is double the true Distance of the Object before the Eye. 1738 R. Smith Compl. Syst. Opticks II. xii. 373 In the distinct base of the telescope..are placed three hairs. 1905 Proc. Optical Convent. 120 Molyneux has also given a problem for determining the breadth of the distinct base. < as lemmas |
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