Two Lens Beam
electron lenses - how to prove graph?
I have a simulation of two cylinders through which an electron beam goes through. The bulge of the equipotential lines make the electrons converge to a focal point then diverge. That's one part. The other part is a graph - showing lens diameters vs. V2/V1 (V = potential). From this graph, it looks like as the lens diameters increase, the ratio V2/V1 decreases exponentially.
Now... how do I connect the two? I have the simulation on a computer program (Simion)... now I need to use that to prove that this graph is correct.
How? I'm not sure what V2/V1 really means... I only have two classes of physics (with grades of C+) behind my belt, so if anyone could please explain the relation between V2/V1 and diameter lenses and guide me in the right direction here, I would be ever so grateful 
Your question is very hard to understand from the limited data you gave. For an electromagnetic lens see this-
http://www.microscopy.ethz.ch/lens.htm
http://www.rodenburg.org/guide/t100.html
Perhaps V1 is potential due to first electron lens and V2 is potential due to second electron lens.
I ran into your question on physicsforums as well-
http://www.physicsforums.com/showthread.php?t=423378
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