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
基本原理,给出了波差法设计复消色差物镜
组。
The principle of secondary spectrum is introduced and the equations of designing apochromatism objective lens based on wave aberration are presented.
介绍了二级光谱基本原理,给出了波差法设计复消色差物镜组。
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.
一种防治近视眼理疗器，它有
为物镜凸
镜、镜筒、目镜，还有头
镜组，它用于人们在近距离上长时间用眼时戴在眼上，可以使被视物像清楚、放大变远。
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