Thin Lens / Mirror Calculator
1/f = 1/do + 1/di — image distance, focal length, or object distance.
Image Distance (di)
15 cm
Focal length f
10 cm
Object dist do
30 cm
Image dist di
15 cm
Magnification
-0.5×
Image type
Real
Orientation
Inverted
Sign convention: real objects/images have positive do/di. Diverging lenses and virtual images have negative values.