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Thin Lens Image Distance Calculator

1/f = 1/d_o + 1/d_i — image distance and magnification.

Calculates image distance, magnification, and whether the image is real or virtual using the thin lens equation from focal length and object distance.

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Dr. Helena Ortiz By Dr. Helena Ortiz
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/d_o + 1/d_i; M = −d_i / d_o

In depth

Calculates image distance, magnification, and whether the image is real or virtual using the thin lens equation from focal length and object distance.