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 | θ76245 |
| 释义 | the world > matter > physics > electromagnetic radiation > heat > [noun] > emission or diffusion > energy produced by > directed flow > meeting point of (2) 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. focal point1692 Optics. The point (or either of the points: see note) on the focal axis of a curved mirror, lens, or lens system at which rays initially parallel to… |
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