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Bert,
I think this is wrong:
"difference is actally 1.5x0.050 = 0.075mm or 75 micron in optical path difference as the refractive index of the silica is 1.5."
The effect on the focus position "in a converging beam" would be 0.5 x 50 micron = 25 micron.
The focus "difference".......
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