Mirror Equation Calculator

Calculate image position for curved mirrors using 1/f = 1/do + 1/di.

cm
cm

Distance de l'image

40.00 cm

Grossissement-1.0000

Image Distance vs Focal Length (+ concave, - convex)

Voir la formule →

Formule

## Mirror Equation The mirror equation is identical in form to the thin lens equation. ### Formula **1/f = 1/d_o + 1/d_i** For a concave mirror, f is positive. For a convex mirror, f is negative. The focal length equals half the radius of curvature: f = R/2.

Exemple Résolu

An object 40 cm from a concave mirror with f = 20 cm.

  1. 011/f = 1/do + 1/di
  2. 021/20 = 1/40 + 1/di
  3. 031/di = 1/20 - 1/40 = 1/40
  4. 04di = 40 cm
  5. 05M = -40/40 = -1 (inverted, same size)