lens maker formula

Question

Lens maker formula (thin lens) is:

RankGuru · Accepted Answer

The **Lens Maker's Formula** relates the focal length ($f$) of a lens to its physical properties:
$\frac{1}{f} = (n_{rel} - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right)$
- $n_{rel}$ is the refractive index of the lens material relative to the surrounding medium.
- $R_1, R_2$ are the radii of curvature of the two lens surfaces.
- Proper **sign conventions** must be used for $R$ (e.g., $R$ is positive if the center of curvature is on the side of the outgoing light).

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lens maker formula

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