The lens-maker's formula for a thin lens (refractive index n) with rad…

Question

The lens-maker's formula for a thin lens (refractive index n) with radii of curvature R₁ and R₂ is:

Accepted Answer

A. 1/f = (n − 1)(1/R₁ − 1/R₂)

**Lens-maker's formula: 1/f = (n − 1)(1/R₁ − 1/R₂)** (thin lens in air; n = refractive index of lens material). Sign convention applies to R₁ and R₂. Used to design lenses or determine f from geometry/material.

Answer

1/f = (n − 1)(1/R₁ + 1/R₂)

Answer

1/f = n (R₁ + R₂)

Answer

1/f = (n + 1)/R