The diameter of a sphere is four times the focal length of a concave mirror cut from it.
凹面镜如果是从圆球上切下来的，圆球的直径会是凹面镜焦距的四倍。
The laser consists of a semiconductor laser with single mode fiber coupled output, polarization controller, PLZT electro-optic ceramic deflector, and output concave mirror.
该激光器由带单模尾纤输出的半导体激光器、光纤偏振控制器、PLZT电光陶瓷偏转器和输出凹面镜等组成。
The laser consists of a semiconductor laser with single mode fiber coupled output, polarization controller, PLZT electro-optic ceramic deflector, and output concave mirror.
该激光器由带单模尾纤输出的半导体激光器、光纤偏振控制器、PLZT电光陶瓷偏转器和输出凹面镜等组成。
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