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sci.lensmakers-equation Calculator
Calculates the focal length of a lens from its radii of curvature and refractive index using the lensmaker's equation. A plano-convex BK7 lens (n=1.517) with R₁ = 100 mm has f ≈ 193 mm — the equation also reveals why meniscus lenses can correct aberrations.
Inputs
Radius1 Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Radius2 Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Refractive Index
Reference formula or conversion factor shown for context.
Lens Thickness Mm
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Results
focal length f (mm)
The computed linear length.
power P (diopters)
Reference formula or conversion factor shown for context.
lens type
The classification or type assigned based on the inputs.