Foucault knife-edge test - Wikipedia
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File:Foucault-Test 2.jpg - Wikipedia
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Parabolizing a Telescope Mirror
![Foucault knife-edge test - Wikipedia](http://www.loptics.com/ATM/mirror_making/foc_hall/rotate_foc.jpg)
Mike Lockwood's Foucault Testing Hall of Shame
![Foucault knife-edge test - Wikipedia](https://www.researchgate.net/publication/228014162/figure/fig1/AS:302332060422152@1449092988642/Foucault-method-for-testing-a-lens.png)
1. Foucault method for testing a lens.
![Foucault knife-edge test - Wikipedia](https://guysmathastro.files.wordpress.com/2023/06/image-52.png)
Telescope Guy's Math & Astro Blog
![Foucault knife-edge test - Wikipedia](https://www.opticsforhire.com/wp-content/uploads/2022/03/cropped-logo.png)
Knife Edge Test for Lens Evaluation
![Foucault knife-edge test - Wikipedia](http://bobmay.astronomy.net/foucault/image028.gif)
Understanding Foucault: A Primer for Beginners
Retinoscopy - Wikiwand
![Foucault knife-edge test - Wikipedia](https://www.testandmeasurementtips.com/wp-content/uploads/2022/01/caustic.jpg)
Going parabolic: The difference between a Ronchi, Foucault, and a Caustic test
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Foucault knife-edge test - Wikipedia
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Automatic Foucault test method based on transverse cutting at two different axial positions near the foci
![Foucault knife-edge test - Wikipedia](https://i.redd.it/oeb4nlripz681.jpg)
3D Printed Knife Edge Tester and Mirror Stand. (WIP) : r/functionalprint
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Léon Foucault - Wikipedia
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