geometrical focal range

例句：

1. 1. The geometrical focal rangeof the lens is 20 cm.
   透镜的几何焦点距离为20厘米。
2. 2.The geometrical focal distance between two pointsis the shortest distance between them.
   两点之间的几何焦点距离是它们之间最短的距离。
3. 3.The geometrical focal distance can be calculatedusing the formula for the distance between twopoints.
   几何焦点距离可以通过两点之间的距离公式计算得出。