| 单词 | visual focus |
| 释义 | > as lemmasvisual focus visual focus n. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > lens > [noun] > focal length or point focus1664 focus1666 focal distance1684 focal point1692 burning-point1698 short focusa1830 visual focus1837 1837 C. R. Goring & A. Pritchard Micrographia 63 What may be called the visual focus of a lens, or its distance from an object upon which we have adjusted its focus as a magnifier. 1867 J. Hogg Microscope (ed. 6) i. ii. 156 The making of the actinic and visual foci coincident. < as lemmas |
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