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,给出了波法设计复消镜的方程。
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,给出了波法设计复消镜的方程。
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.
一种防治近视眼的理疗器,有为镜的凸透镜、镜筒、目镜,还有头套和透镜,于人们在近距离上长时间眼时戴在眼上,可以使被视的像清楚、放大和变远。
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