Drag to rotate • scroll to zoom. The red surface is the spherical cap; R lines run to the centre of curvature, with SAG and Diameter/2 labelled as in the formula illustration. Drawn to scale in mm.
SAG = |R| − √( R2 − (D/2)2 ) ≈ D2 / (8R)
R = radius of curvature • D = diameter. The paraxial approximation D2/(8R) is good when D/2 << R.
Note: use American number formatting (e.g. enter “2.5”, not “2,5”).
Description
Determine the sag of a surface based on radius of curvature and diameter.
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