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A thin lens made of glass has a focal length in air of 16.1 cm. A lens of exactly the same shape is then made from diamond.

HINT: Review the derivation of the thin lens formula. Note that the index of refraction, n, used in the derivation is actually the relative index of refraction: n = n lens/n surrounding

a) What is the focal length of the diamond lens in air?

b) What is the focal length of the diamond lens in when it is immersed in water?

I was not sure at all how to even get started on this problem.