Physics

Lens / Mirror Equation Calculator

Lets users compute and verify lens / mirror equation instantly with formula, steps and examples — no manual math.

Enter your details

cm
cm
Your result
Image distance
15 cm

1/v = 1/f − 1/u gives image distance 15.00 cm, magnification -0.50×.

Magnification
-0.5 ×
Image type
Real, inverted

About this calculator

Thin-lens / mirror equation 1/f = 1/v + 1/u (using the Cartesian real-is-positive convention here as 1/v = 1/f − 1/u). Magnification m = −v/u; positive m is upright, |m|>1 enlarged.

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