1·A convex lens is used to concentrate rays of light.
凸透镜用于聚集光线。
2·A single convex lens is used to produce an enlarged image.
能够产生放大图像的单个凸透镜。
3·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。
4·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。
5·A convex lens causes rays to converge on a single point, the focal point.
会聚透镜使光线会聚于一点，即焦点。
6·In this paper, a measuring method of convex lens foci in collimator is given.
介绍一种测量平行光管内凸透镜焦距的测量方法。
7·A convex lens is thicker at its center than its periphery. It causes rays to converge.
凸透镜中心部分比周围要厚，它使光线会聚。
8·Two kinds of convex lens which make parallel light rays converge to the focal point are given.
本文给出两种能使平行光严格聚焦于一点的凸透镜。
9·Wearing lower degree convex lens can reduce incidence rate of myopia in primary school students.
配戴低度凸透镜可降低小学生近视的发生率。
10·The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。