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Dec 12 at 2:16 comment added scottbb Alan, that's the thin lens formula. The lens maker's formula uses the refractive index and the surface powers (i.e., reciprocal surface radii) of the lens.
Dec 10 at 4:42 vote accept Bram
Dec 10 at 4:42 comment added Bram Thank you so much. It works with the image above: 1/20 = 1/60 + 1/30 and it’s pretty cool to have a name like that for the formula.
Dec 9 at 18:48 history answered Alan Marcus CC BY-SA 4.0