Tag Archives: caustic

What is optical testing "Caustic".

IT IS’ born in 1939 and used to measure very accurately (impossible to Foucault test for reasons which we shall see here later looking at the title: REASONS WHY THE FOUCAULT TEST IS INACCURATE FOR LOW FOCALS RATIOS MIRRORS)) the radii of curvature of a parabolic mirror, or even more deformed figure from, a very short focal ratio (that is more inferior to F5) and a diameter over 300 or […]

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