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About: Sagitta (optics)     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Thing100002452, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingyago:WikicatOpticsyago:BodyPart105220461yago:Eye105311054yago:Organ105297523yago:Part109385911yago:PhysicalEntity100001930yago:SenseOrgan105299178yago:Thing100002452 New Facet based on Instances of this Class

In optics and especially telescope making, sagitta or sag is a measure of the glass removed to yield an optical curve. It is approximated by the formula , where R is the radius of curvature of the optical surface. The sag S(r) is the displacement along the optic axis of the surface from the vertex, at distance from the axis. A good explanation both of this approximate formula and the exact formula can be found here.