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.

Step by Step calculation   

Lensmakers Equation formula

1/f = (n1/nm - 1) * (1/r1 - 1/r2)


n1 is Refractive Index of Lens Material

nm 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