Step 1:
Recall the lens maker's formula for a thin lens in air:
$$\frac{1}{f} = (n-1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$$
where $f$ is the focal length, $n$ is the refractive index of the lens material, and $R_1$ and $R_2$ are the radii of curvature of the
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