Optics and Optical Design - 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: https://youtu.be/LnnYwbhP7w4 FRED is a product of Photon Engineering, https://photonengr.com/ Please consider clicking on "LIKE". I don't get paid for creating this content, and your positive feedback is the only encouragement that I receive to continue creating this kind of helpful material. 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)