Lensmaker's Equation Calculator

Lens Power

If Lens is not immersed in Ambient Medium, value of Refractive Index of Ambient Medium is "1".

Lensmaker's Equation formula:

**1/f = (n _{l}/n_{m} - 1) * ( 1/r_{1} - 1/r_{2})**

where:

f: Focal Length, in meter

n

n

r

r

This equation holds for all types of thin lenses. A radius of curvature is positive when its center of curvature lies to the right of the surface, and negative when its center of curvatures lies to the left of the surface. For Lens in close contact, the power of the combined Lens is equal to the sum of their individual Lens Powers.