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Focal Length Calculator
Calculate lens focal length using the thin lens equation
Formula: $\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$ (where $f$ is focal length, $d_o$ is object distance, and $d_i$ is image distance). Enter values below.
Optical Parameters
Calculation Results
⚠️ For physics, optics, and photography reference purposes only.