Lensmakers Focal Length Equation Calculation

Lensmakers Equation Calculator

This lens tool to calculates the focal length based on radii of curvature of the 2 surfaces of the lens.

Radius of Curvature of the First Surface (r₁)

Radius of Curvature of the Second Surface (r₂)

Refractive Index of Lens Material (n₁)

gmol/liter

Refractive Index of Ambient Medium (n_m)

kelvin

Step by Step calculation

1/f = (n₁/n_m - 1) * (1/r₁ - 1/r₂)

Where,

n₁ is Refractive Index of Lens Material

n_m is Refractive Index of Ambient Medium

r₁ is Radius of Curvature of the First Surface

r₂ is Radius of Curvature of the Second Surface

f is focal length