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。
On the assumption that there was a small solid sphere in the focusing area, the scattering field of concave sphere ultrasonic transducer was analyzed.
以凹球面超声换能器为研究对象，假设聚焦区存在一刚性球形微粒，对此时的散射场进行分析。
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