optical path difference

例句：

1. 1.The optical path difference between the two lenses is crucial for focusing light.
   两个透镜之间的光路差对于聚焦光线至关重要。
2. 2. In optical engineering, the measurement of this difference is essential for designing lenses.
   在光学工程中，测量这种差异对于设计透镜至关重要。
3. 3.The optical path difference can be used to calculate the focal length of a lens.
   光学路径差可以用来计算透镜的焦距。