Thin Lens Equation Calculator
Free calculate focal length, image distance, object distance, and magnification using the thin lens equation. works for convex (converging) and concave (diverging) lenses.
Input Parameters
Results
Enter parameters to calculate lens properties
Thin Lens Equation
Lens Equation
1/f = 1/dₒ + 1/dᵢ
Where:
- • f = focal length
- • dₒ = object distance
- • dᵢ = image distance
Magnification
m = -dᵢ / dₒ
Sign conventions:
- • Convex: f > 0
- • Concave: f < 0
- • Real image: dᵢ > 0
- • Virtual image: dᵢ < 0