the distance from a lens, lens system, or curved mirror to its focus along its focal axis; = focal distance, n. 1.
单词 | θ115778 |
释义 | the world > relative properties > number > geometry > curve > [noun] > with regard to distance (4) focal length1682 the distance from a lens, lens system, or curved mirror to its focus along its focal axis; = focal distance, n. 1. focal distance1705 Geometry. The distance between any given point of an ellipse or hyperbola and one of its foci. In early use also: the distance between the foci… power of a point1872 Mathematics power of a point n. (with regard to a circle or sphere) the square of the distance from a given point to the point of contact of a… curve or line of striction1875 Geometry. In a skew surface, curveor line of striction: see quots. |
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