Question

write The Lens Maker Formula​

Answer 1

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Answer 2

Lens Maker's Formula -- from Eric Weisstein's World of Physics.

$\frac{1}{f} = |n - 1| | \frac{1}{r1} - \frac{1}{r2} |$

where f is the focal length, n is the index of refraction, and and are the radii of curvature of the two sides of the lens.