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
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
理疗器，它有作为物凸透、筒、目，还有头套和透组，它用于人们
近距离
长时间用时戴，可以使被视物像清楚、放大和变远。
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