a central point from which lines or rays diverge; (Astronomy) the radiant (sense B. 3) of a meteor shower.
| 单词 | θ76294 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > point from which rays proceed (6) radiant point1665 a central point from which lines or rays diverge; (Astronomy) the radiant (sense B. 3) of a meteor shower. focus1704 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. focal point1713 Optics. Any point at which rays converge (or from which rays appear to diverge) in reflection or refraction; = focus, n. 5b. radiant1728 Physics. A point, or a small region or object, from which light or heat radiates; a substance or object emitting radiation. Now rare. radiator1811 Something that radiates heat, light, or any other form of energy. point source1894 (a) a source (as of light or sound) having negligible dimensions, or considered as a mathematical point; (b) Ecology a source of pollution that… |
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