Thin lens image distance
Thin lens image distance: use focal length, object distance. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
1/f = 1/dₒ + 1/dᵢ; dᵢ = fdₒ/(dₒ−f)
Variables & units
- Focal length
- m · minimum -1000000000000, maximum 1000000000000
- Object distance
- m · minimum -1000000000000, maximum 1000000000000
Worked example
Use the displayed example inputs, then follow the substituted values in the solution.
Assumptions
Thin-lens paraxial approximation with the real-is-positive sign convention.
References
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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