Paraxial Ray Tracing Using Matrices, with a FRED Example of a Cassegrain Telescope

The ray tracing matrices are explained, emphasizing the reflection matrix. I find the system matrix for a Cassegrain telescope with an eyepiece and use it to compute the correct location of the eyepiece. The result is confirmed by simulating it in FRED.
Although suitable to watch alone, this is a continuation of the video: • Paraxial Ray Tracing U...
FRED is a product of Photon Engineering, photonengr.com/
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References include:
Eugene Hecht, Optics, 4th ed. (Addison-Wesley, 2001)
J. Geary, Lens Design, Introduction to Lens Design: With Practical Zemax Examples, (Willmann-Bell, 2002)
Pedrotti, Pedrotti, and Pedrotti, Introduction to Optics, 3rd ed. (Pearson, 2007)

[@Ismailia007]

Amazing videos.
Could you also make another video detailing the Seidel sums for a glass plate (2 parallel surfaces, thickness t, and index n) in air?

[@benm4823]

Hi Stephen, thanks for making and sharing optics videos. Your Zemax videos are really helpfull. A video that reviews Zemax from basic to setting up complex non sequential systems will be really valuable.

[@mas13662002]

Can you show your steps for backward raytracing please.thanks