Lens Equation Rechner — Formel
## Thin Lens Equation
The thin lens equation relates object distance, image distance, and focal length.
### Formula
**1/f = 1/d_o + 1/d_i**
Positive focal length for converging lenses, negative for diverging. Magnification: **M = -d_i / d_o**. Negative M means inverted image.
The thin lens equation relates object distance, image distance, and focal length.
### Formula
**1/f = 1/d_o + 1/d_i**
Positive focal length for converging lenses, negative for diverging. Magnification: **M = -d_i / d_o**. Negative M means inverted image.
Lösungsbeispiel
An object 30 cm from a converging lens with focal length 10 cm.
- 1/f = 1/do + 1/di
- 1/10 = 1/30 + 1/di
- 1/di = 1/10 - 1/30 = 3/30 - 1/30 = 2/30
- di = 15 cm
- M = -15/30 = -0.5 (inverted, half size)