Glossary
- Ronchi grating A transparent plate ruled with black lines and equal, clear spaces. It is used as a multiple knife-edge for testing a concave mirror.
- Foucault knife-edge test The Foucault test is performed by moving a knife edge laterally into the image of a small point source. The eye, or a camera, is placed immediately behind the knife edge, and the exit pupil of the system is observed.
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nonspherical mirrorsFoucault knife-edge testcurved shadowscurved linesrulingsstraight shadowsgratings ronchiFoucault testoptics