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,给出了波差法设计复消色差物
的方
。
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,给出了波差法设计复消色差物的方。
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.
种防治近视眼的理疗器，它有作为物的凸透、筒、目，还有头套和透，它用于人们
近距离上长
间用眼
眼上，可以使被视物的像清楚、放大和变远。
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