Lensmaker's equation
= Lensmaker's equation
For a thin <optical lens> in air, surface radii $R_a,R_b$ and <refractive index> $n$ give $1/f=(n-1)(1/R_a-1/R_b)$. The radii carry the usual signed curvature convention.
= Lensmaker's equation
For a thin <optical lens> in air, surface radii $R_a,R_b$ and <refractive index> $n$ give $1/f=(n-1)(1/R_a-1/R_b)$. The radii carry the usual signed curvature convention.