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  1. Agent739

    Optical System Design-Fischer,Tadic-Galeb,Yoder Page 44 Fig3.7?

    I am just trying to interpret the illustrations correctly...what are the small circles at what appears to be the focal point in the lower three lenses supposed to represent?Is it entrance pupil?
  2. Agent739

    Chief Ray

    Looking for alternative explanation about the concept of chief ray and principle ray.In relation to arpeture stop,exit and entrance pupil.

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