In this video I go through an Excel YNU Spreadsheet which is used to compute several paraxial ray quantities, including effective focal length and spherical aberration, of a Cooke triplet lens.

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I make a lot of videos showing spreadsheets and MatLab code that are useful for optical design. The purpose is to help people who wish to make their own spreadsheets, or to write their own code. Please don't ask me to post my own files. Write your own. That's the idea.

Reference: Joseph M. Geary, Introduction to Lens Design, with Practical ZEMAX Examples, Chapter 4 (Willmann-Bell, Inc, 2002).

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