Wednesday, 15 July 2020

optics - Is there a formula for determining the focal point of a sphere?


I guess this is the same as for cylinders, when light is shone through parallel to the cross-section, but Google-ing this only turns up lenses like the ones used in glasses.


I'm looking for something like what's described in this article: http://spie.org/x34513.xml


I hope to determine the veracity of the equation described there.



Answer



At your request. Here's somebody working it out for you.


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