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How do I determine focal point of a lens using Geometrical Optics?

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My model is running well and I've turned off secondary rays so the point is quite clear to the naked eye but there must be some way to determine this point through the software. I've looked at several relevant models but none included this feature. Thanks for the help!

0 Replies Last Post 27.09.2015, 16:58 GMT-4
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Hello Lorenzo Bilbao

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