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It would be great if we could analyze arbitrary optical systems just like we analyze thin lenses - with a single focal length. Using the effective focal length, we can do just that. In this video I explain what the effective focal length and (2nd) principal plane are, and how to find them mathematically using ray transfer matrices.

This is part of my series on semiconductor physics (often called Electronics 1 at university). This is based on the book Semiconductor Physics and Devices by Donald Neamen, as well as the EECS 170A/174 courses taught at UC Irvine.

Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.

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