發(fā)現(xiàn)zemax中的近軸光線與我想的不太一樣，它原文是這么說的 f]CXu3w(J  
To ensure these features work properly, even for optical systems that do not meet the paraxial assumption above, Zemax traces “parabasal” rays which are real (real means using Snell's law explicitly) that make small angles with respect to a reference ray, which is usually an axis or chief ray.   ;e