Hi guys,
Calculate the radius of the depressed curve required to give a total add if +3.25D, if radii of r1 = +87.17mm.
r2= +348.67mm, are ground on a lens with n=1.523 and n=1.678.
What on earth is a depressed curve?
A little nudge please guys. Sorry to be sucking off your brains again, but I've got no one else~ :P
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