Engineering calculator

Thin Lens Calculator

Calculate focal length, object distance, image distance, and magnification using the thin lens equation (1/f = 1/do + 1/di).

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Source / method note

This calculation uses the paraxial thin lens approximation. For thick and multi-element lenses, principal planes must be considered. Sign convention: di is positive for real images, negative for virtual images. f is positive for converging lenses, negative for diverging lenses.

Legal / official rate note

This tool is for educational and general purposes. Official design software should be used for critical engineering applications requiring precise optical design and calibration.

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