convex lens

常见例句

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。
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；
This paper focuses on four main types of axial-symmetrical electrostatic lens: film aperture lens double-cylinder immersion lens convex lens and immersion object lens.
本文具体分析了膜孔透镜，浸没双圆筒透镜（括等径和不等径），单透镜和浸没物镜这四类最主要的静电透镜。