By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.
用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
Once unleashed, the power channels through a positively charged continuous energy lens at the center of the handle.
一旦被释放，能量会通过剑柄中部带正电荷的能量透镜。
It will be used in the illumination system of high power semiconductor laser over a long infrared distance of 100 meters through adjusting an additional geometric optical lens.
然后通过调节外加的几何光学透镜，在长达100米的红外远距离大功率半导体激光器照明系统中将得到利用。
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