The principle of secondary spectrum is introduced and the equations of designing apochromatism objective lens based on wave aberration are presented.

介绍了二级光谱的基本原理,给出了波法计复消色物镜的方程组。

A physiotherapeutic apparatus for preventing and treating near sighted eye has a convex lens used as objective lens, lens cone, eyepiece, headgear and lens set.

一种防治视眼的理疗器，它有为物镜的凸透镜、镜筒、目镜，还有头套和透镜组，它用于人们离上长时间用眼时戴眼上，可以使被视物的像清楚、放大和变远。