Thick Lens Equation calculator
Effective focal length & principal planes for a thick lens.
Category: Geometric Optics
Formula: 1/f = (n-1)[1/R₁ - 1/R₂ + (n-1)d/(n·R₁·R₂)]
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Index n | n | 1.5 | |
| R₁ | R1 | mm | 100 |
| R₂ | R2 | mm | -100 |
| Thickness d | d | mm | 5 |
Result with the default inputs
- EFL f: 100.8403 mm
- H₁ (from V₁): 1.6807 mm
- H₂ (from V₂): -1.6807 mm
Open it with your own values: put each input in the address as a parameter, for example /calculators/thick-lens-equation?n=1.5. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Thick lens