| 单词 | crossed cylinder |
| 释义 | crossed cylinder [¦krȯst `sil·ǝn·dǝr] OPTICS 1. A thin lens whose surfaces are portions of circular cylinders whose axes cross at right angles or obliquely. 2. A weak lens whose effect is equivalent to that of lenses with convex and concave cylindrical surfaces of equal curvature crossed at right angles. |
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