How does the Thin Lens Calculator work?

Enter any two of: object distance (s_o), image distance (s_i), or focal length (f) Then: The calculator applies 1/f = 1/s_o + 1/s_i Then: Results show lens behavior and image characteristics.

Can you give an example of how to use the Thin Lens Calculator?

Example: Input s_o = 30 cm, f = 10 cm gives a result of s_i = 15 cm, magnification = 0.5× (Real inverted image).

Is the Thin Lens Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Thin Lens Calculator?

Our Thin Lens Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Thin Lens Calculator

Thin Lens Equation

Focal Length (m)

Object Distance (m)

Image Distance (m)

Thin lens equation relates object distance, image distance, and focal length. It's fundamental to cameras, microscopes, telescopes, and corrective lenses.

Symbol	Name	Unit	Description
f	1/s_o + 1/s_i	—	1/s_o + 1/s_i

Difficulty:intermediate

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Did You Know?

The thin lens approximation assumes the lens is much thinner than its curvature radius; thick lenses require more complex equations.

References

›Thin Lens Equation

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Thin Lens Calculator

Thin Lens Equation

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