a lens such that a parallel beam of light passing through it is caused to diverge or spread out 同义词：diverging lens,
例句与用法
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。
2.
Some are flared ? that is , thicker at the rim than in the center , like a concave lens 有些呈喇叭形即边缘较中心厚，类似凹透镜。
3.
We fabricated a large computer - generated holography on a concave lens 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。
4.
We demonstrate experimentally the technique to fabricate large does in the thick film on a concave lens ( mirrors ) surface with precise alignment by using the strategy of exposure twice 采用两次曝光的方法在凹透镜表面上厚光刻胶中制作衍射光学元件。
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