Sagitta (optics)
id:
sagitta-optics-310-12349605
title:
Sagitta (optics)
text:
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 r from the axis. A good explanation both of this approximate formula and the exact formula can be found here.
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Sagitta_(optics)
date created:
date modified:
2022-03-28T13:44:57Z
main entity:
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image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/7/7e/Sagitta_%28optics%29.jpg","width":736,"height":562}
fields total:
13
integrity:
14