a lens such that a parallel beam of light passing through it is caused to diverge or spread out
双语例句
1. Just as a double convex lens enlarges so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
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2. Just AS a double convex lens enlarges, so a double concave lens reduces.
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
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3. This paper describes a diverging fibre that is analogous to a concave lens.
本文讨论一种发散型光学纤维，它类似于凹透镜。
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4. A concavelens causes rays to diverge as though they are coming from a focal point.
发散透镜使光线分开，就好象从焦点上发出来的那样。
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5. The invention provides a method with a concave lens focus as a welding heat source and a welding device thereof.
本发明提供一种以凸透镜焦点为焊接热源的方法及其焊接装置。
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6. This article introduces a method of measuring the radial of a concavelens with laser, grating and vemier caliper.
介绍了一种利用激光、光栅、游标卡尺测量凹透镜球面半径的方法。
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7. We fabricated a large computer-generated holography on a concavelens surface to test the convex secondary mirrors surface.
在凹透镜表面上制作出了用于凸非球面检测的曲面全息图。
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8. Firstly, a telescope system is made up with a concavelens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；
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9. An approach is proposed, which emphasizes the importance of concave lens which can scatter the laser and make it an ideal signal source to be captured by the CCD lens.
10. The observation lens is the single-tube visual lens, eyeglass is made of a concavelens, and the inner part of a lens tube is provided with a visual distance increasing device.
所述的观测镜是单筒目视镜，目镜用凹透镜制成，镜筒内部设有视距增长装置。
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11. Water surges from the cells on the inside of the leaf to those on the outside, causing the leaf to rapidly flip in shape from convex to concave, like a soft contact lens.
水从叶子内部的细胞涌向外面的细胞，导致叶子迅速地从凸向凹翻转，就像一片柔软的隐形眼镜。
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12. Objective: to observe the effect of concave and convex on growing and the refractive developing of guinea pig eyes and to establish lens-induced animal model of myopia or hyperopia.
目的：观察凹透镜和凸透镜对豚鼠眼球生长和屈光变化的影响，建立透镜诱导型屈光不正动物模型。
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13. First, the team placed two concave mirrors 1 micrometre apart, and filled the lens-shaped cavity between them with a red liquid dye.
首先，实验小组放置了两面相距一微米的凹镜并向其间透镜状的中空部分填充一种红色液体染料。
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14. Among the reshaping systems converting a Gaussian beam to a flattop beam, the system composed of a plane-concave and a plane-convex lens, is a relatively simple structure.
