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.
By digitization , we optimize the intensity data of the incidence beam at the vicinity of start point and end point . 3 通过选择合适的涂胶参数，在凹透镜表面上进行了薄光刻胶胶层的均匀涂布。
5.
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。
6.
I copied a reproduction of the silverpoint using a homemade epidiascope based on a small circular concave mirror and direct solar illumination , and when i deliberately “ bumped ” my own epidiascope , i found such a mismatch to be very conspicuous 我用小型的圆凹透镜与阳光组成的自制幻灯机，从银尖笔画复制了一张画，而当我蓄意碰撞自己的设备后，我发现位移结果是非常醒目的。
7.
Discussions and preliminary experiments are given for some potential applications of left - handed materials . experimental results which are in accordance with expects for the focusing of plane wave using symmetric rings and the focusing of radiate source using rings are obtained . simulation results are also obtained concerning the - like structure based backward radiate antenna and transmission line based left - handed structures 对称环结构异向介质凹透镜的平面波聚焦、结构异向介质的点源会聚等实验都得到了和预期接近的初步结果；对基于结构全固态异向介质后向波介质天线微波异向介质的实验研究和基于微带电路结构单元的异向介质进行了计算机仿真研究，也取得了较好的结果。
