英语词汇“principal point”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	principal point
释义	principal point noun 1. : the point at which a principal visual ray intersects a perspective plane 2. : either of two points on the axis of a lens so related that a ray from any point of the object directed toward one principal point will emerge from the lens in a parallel direction but directed through the other principal point 3. : the point where the optical axis of the lens meets the film plane in an aerial camera
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