The Radius of Curvature of a Lens away from Light Source calculator computes the radius of curvature (r2) based on its geometry and material index of the lens and surrounding material.
INSTRUCTIONS: Choose units and enter the following:
(nlens) Refraction Index of Lens Material.
(nmedium) Refraction Index of Surrounding Material.
(r1) Radius of Curvature of Lens Toward Light Source.
(f) Focal Length of Lens.
Radius of Curvature(r2): The calculator returns the radius in meters. However, this can be automatically converted to other length units via the pull-down menu.
The Math / Science
This Lens Maker's Equation1(solved for `r_2`) calculates the radius of curvature of the side of a lens that faces away from the object, given its geometry and surroundings. For more information on and versions of the Lens Maker's Equation, please see the Lens Maker's Equation Calculator page.