focal surface

• 焦面,焦曲面

focal surface的用法和样例：

例句

1. The key places for such manipulation are the back focal plane of the objective and the front focal plane of the substage condenser.
   最关键的地方为物镜的后焦面和载物台下聚光镜的前焦面。
2. The encircled-power method is introduced to define the beam width and real focal plane of focused sinh-Gaussian beams, thus their focal shift can be determined.
   使用环围功率法定义束宽和实际焦面，由此可以决定聚焦双曲正弦高斯光束的焦移。