Use the mirror equation to compute the relationship between focal length, image distance, and object distance for spherical mirrors. Works for both concave and convex mirrors.
Enter your values below
Negative for real objects placed in front of the mirror.
Leave blank to calculate image distance.
Leave blank to calculate focal length.
How this calculator works
The mirror equation connects focal length f, image distance v, and object distance u. Sign convention: distances in front of the mirror are positive for concave mirrors.
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.
