What methods and instruments are used to test the optical perfection of convex (parabolic) secondary mirrors for telescopes? - Quora
Ronchi test
NASA's James Webb Space Telescope completes f | EurekAlert!
Self-Portrait of NASA's James Webb Space Telescope Marks Critical Test | NASA
Testing Telescope Mirrors at the Chabot Space and Science Center
Ronchi and Foucault Tests on the 20" f/4.5 Quartz Telescope Mirror - YouTube
Ronchi test
Successful Mirror Deployment Test | Spring has arrived, the … | Flickr
Introduction to Telescope Mirror Polishing and Ronchi testing of Mirror - YouTube
Parabolizing a Telescope Mirror
Ronchigrams for a primary mirror of a Newtonian telescope (parabolic... | Download Scientific Diagram
Parabolizing a Telescope Mirror
OPTICAL TESTS - AstroReflect
Matching Ronchi Test - The ATMs Workshop
Mike Lockwood's Foucault Testing Hall of Shame
NASA's Webb Successfully Completes Second Super-Cold Optical Test | NASA
NASA's James Webb Space Telescope Completes Primary Mirror Test - NASASpaceFlight.com
Matching Ronchi Test - The ATMs Workshop
Ronchi Matching Test
DIY TELESCOPE primary mirror off-axis TESTING - YouTube
Foucault test
Four Lessons in Mirror Testing
Matching Ronchi Test - The ATMs Workshop
Foucault knife-edge test - Wikipedia
NASA - The "Not So Heavy Metal Video": James Webb Space Telescope's Beryllium Mirrors
Mike Lockwood's Foucault Testing Hall of Shame
