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sci.lens-makers-equation Calculator
Calculates focal length of a lens from radii of curvature and refractive index using the lensmaker's equation: 1/f = (n−1)(1/R₁ − 1/R₂). A biconvex BK7 glass lens (n=1.517) with R₁ = 50 mm, R₂ = −50 mm has f = 48.3 mm.
Inputs
N Lens
Reference formula or conversion factor shown for context.
R1 Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
R2 Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
T 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.
optical power P (diopters)
Reference formula or conversion factor shown for context.
1/f (thin lens) = (n−1)·(1/R1 − 1/R2)
Sample size or count used in the calculation.
lens type
The classification or type assigned based on the inputs.
R1/R2 ratios
The proportional relationship between two quantities.