Convert focal length in metres to optical power in diopters using P = 1/f. For optometry, eyeglass prescription and unified optical system power.
输入焦距 f(米),求光焦度。
| Item | Standard / Source | Key Point |
|---|---|---|
| Optical power (dioptre) | SI-derived unit, dioptre = m^-1; Classic optics (Hecht, Optics, 5th ed.) | P = 1/f with f in metres |