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·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。
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。
4·A concave lens 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。
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。
6·This article introduces a method of measuring the radial of a concave lens 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。
7·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。
8·Firstly, a telescope system is made up with a concave lens 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；
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.
本文提出以凹透镜散射法将待测光源转化为镜头可以直接捕捉的理想光源，从而大大提高了点的测量精度，充分利用了激光作为信号源所体现的优势。
10·The observation lens is the single-tube visual lens, eyeglass is made of a concave lens, 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。