Sag of a Spherical Surface calculator
Sagitta of a spherical (or conic) surface from radius and aperture.
Category: Aberrations
Formula: z = c·r²/(1 + √(1 − c²·r²)), c = 1/R
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Radius R | R | mm | 100 |
| Half-aperture r | r | mm | 12.5 |
Result with the default inputs
- Sag: 0.7843 mm
Open it with your own values: put each input in the address as a parameter, for example /calculators/sag-of-a-spherical-surface?R=100. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Sagitta (optics)