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**[HELP!] A Confusing Optic Problem**

## Homework Statement

Prove that, according to the figure below:

and

## Homework Equations

## The Attempt at a Solution

I've been using the basic equation above (the integrated lenses with radius r

_{1}and r

_{2}) but it's still confusing. Is it the total focus of the lens is 1/f = 1/f

_{1}+1/f

_{2}? 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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