- #1
mypony4eva
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Homework Statement
We take a sphere (1mm) which has a parabolically changing refractive index, which is given in a function.
Homework Equations
Depending on the gradient of the refractive in the sphere, how does it correlates with the focal length.
The Attempt at a Solution
I know I saw somewhere an analytic solution (or at least an analytically derived approximation) formula somewhere, but I don't have a clue where to find it.