정답
$\frac{1}{f} = (n - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right)$, where $R_1$ and $R_2$ are the radii of curvature.
해설
Convex lenses have positive focal lengths in air; concave lenses have negative focal lengths.
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What is the Lens Maker's Formula for a thin lens in air?
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