单词 | primary focus |
释义 | primary focus [`prī´mer·ē `fō·kǝs] OPTICS In an astigmatic system, a line at which some of the bundle of rays from an off-axis point meet; this line is perpendicular to a plane which contains the point and the optical axis, and has a smaller image distance than the secondary focus. Also known as meridional focus; tangential focus. |
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