# Foucault knife-edge test

> optical test for curved mirrors

**Wikidata**: [Q1439729](https://www.wikidata.org/wiki/Q1439729)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Foucault_knife-edge_test)  
**Source**: https://4ort.xyz/entity/foucault-knife-edge-test