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Videology Industrial-Grade Cameras - Custom Embedded Cameras LB 2024
Photonics Dictionary

sag

1. In the geometric sense, an abbreviation for the term "sagitta,'' the height of a curve measured from the chord.
 

 
and it is exact for a parabola. 2. Conforming a sheet of glass to a ceramic or metal form by heating the glass to its softening point and allowing it to settle.
 
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