What is the cause of spherical aberrations in lenses? I know that it's due to the differing width of the lens, but I don't understand/know the physics of why the lens width affects the focal distance of the light ray. I've seen a lot of optics before, but presently about all I know is that we posit that lenses obey 1f=1O+1I
where f is the focal distance, I is the image distance, and O is the object distance.
So how do we see that the lens width should have an effect on the focal distance?
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