When PLEN/OPTH operands are used for systems with Paraxial surfaces, return values that are smaller than the actual optical path may be obtained. What is the reason for this?
For example, in the following 4F system based on Paraxial Lens, the intermediate parallel propagation distance is defined as 16 mm, but the return values of PLEN for marginal rays (Px and Py not equal to 0) are less than 16 mm:
Could you please help me determine where the problem is?
Best answer by Haosheng.Hu
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