英语词汇“secondary focus”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	secondary focus
释义	secondary focus secondary focus [′sek·ən‚der·ē ′fō·kəs] (optics) In an astigmatic system, a line at which some of the bundle of rays from an off-axis point meet; this line lies in a plane which contains the point and the optical axis, and has a greater image distance than the primary focus. Also known as sagittal focus.
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