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Thin Lens Object Distance & Focal Calculator

1/f = 1/do + 1/di — thin lens equation for optics.

Solves the thin lens equation to find image distance, magnification, and whether the image is real or virtual from object distance and focal length.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

1/f = 1/do + 1/di; m = −di/do

In depth

Solves the thin lens equation to find image distance, magnification, and whether the image is real or virtual from object distance and focal length.