Optics. Any point at which rays converge (or from which rays appear to diverge) in reflection or refraction. Cf. virtual focus at virtual, adj. 5.
| 单词 | θ76297 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > meeting point (10) focus1664 Optics. Any point at which rays converge (or from which rays appear to diverge) in reflection or refraction. Cf. virtual focus at virtual, adj. 5. visual point1679 focal point1713 Optics. Any point at which rays converge (or from which rays appear to diverge) in reflection or refraction; = focus, n. 5b. chemical focus1841 the point or distance at which a lens or optical instrument focuses light so as to expose a photographic film. point focus1908 a focus of a beam of light, particles, etc., which is small enough to be considered as a point. Subcategories:— convergence (1) — degree of convergence or divergence (1) — concentration (1) — conjunction (1) — non-convergence (1) |
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