Determine the required object distance to produce an image at a specified location for a given focal length. Useful in optical system design and experimental setups.
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Desired distance from the optical element to the image.
Focal length of the lens or mirror being used.
How this calculator works
Rearranged lens/mirror equation solved for object distance u. Negative u indicates a virtual object.
Common questions about this calculator
These calculators are for educational and informational purposes only. While we strive for accuracy, results should be verified for critical applications. Always consult authoritative sources for engineering or scientific work.
