## [HELP!] A Dazzling Optic Problems

1. The problem statement, all variables and given/known data
Prove that, according to the figure below:
$\frac{1}{S_{1}}+\frac{n}{S_{1}^{'}}=\frac{n-1}{r_{1}}$
and
$\frac{n}{S_{2}}+\frac{1}{S_{2}^{'}}=\frac{1-n}{r_{2}}$

2. Relevant equations
$\frac{1}{f}=(\frac{n_{2}}{n_{1}}-1)(\frac{1}{r_{1}}+\frac{1}{r_{2}})$

3. The attempt at a solution
I've been using the basic equation above (the integrated lenses with radius r1 and r2) but it's still confusing. Is it the total focus of the lens is 1/f = 1/f1+1/f2? And should I substitute it into the relevant equation above? After all, I still can't proceed, because I don't know what should I do next :(
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 Tags lens, lenses, optic, physics

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