凸透镜

Objective To investigate the effect of lower degree convex lens on preventing myopia of primary school students.

目的 探讨低度凸透镜预防小学生视近的效果。方法采用随机分组的方法将男女各半的 16 0 0名小学三年级正视眼学生分为实验组和对照组。

The hardware structure platform of this system consists of light source Super LED, Web Cameras and Convex Lens.

本系统之硬体架构平台是使用光源、网摄影机和凸透镜所组成。

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。

In general, two faces of a convex lens are parts of a sphere.

张清通常凸透镜的曲面是球面。

Large convex lens produces image that is viewed through the ''.

通过目镜观察物体图像的大的凸透镜。

Large convex lens produces image that is viewed through the eyepiece .

通过目镜观察物体图像的大的凸透镜。

As shown, a thin convex lens with focus length 10 cm and a concave

如上图所示，一焦距为10 cm的薄凸透镜和一半径为20 cm的凹球面反射镜共轴。P点球心

A convex lens is used to concentrate rays of light.

凸透镜用于聚集光线。不适合

Long-sightedness can be corrected with a convex lens that ensures light rays fall on the retina and focus accurately.

长期近视可以纠正一个凸透镜，确保光线落在视网膜和重点，准确。

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。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。