Kostenloser Focal Length Rechner

Berechnen Sie focal length aus object und image distances. Kostenloser focal length und diopter Rechner.

cm
cm

Brennweite

10.00 cm

Lens Power10.00 diopters

Focal Length vs Object Distance

Formel anzeigen →

Formel

## Focal Length The focal length defines the converging or diverging power of a lens or mirror. ### Formula **1/f = 1/d_o + 1/d_i** Lens power in diopters is **D = 1/f** (with f in meters). Positive focal length = converging lens; negative = diverging.

Lösungsbeispiel

An object at 30 cm produces an image at 15 cm.

  1. 011/f = 1/do + 1/di
  2. 021/f = 1/30 + 1/15
  3. 031/f = 0.0333 + 0.0667 = 0.1
  4. 04f = 10 cm
  5. 05Power = 100/10 = 10 diopters