Sagitta (optics)

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In optics and especially telescope making, sagitta is a measure of the glass removed to yield an optical curve. It is approximated by the formula

$S={\frac {r^{2}}{2\times {\text{ROC}}}}$

$S={\frac {r^{2}}{4\times {\text{focal length}}}}$

A good explanation both of this approximate formula and the exact formula can be found at http://www.opticampus.com/popcourse.php?url=high_powered/#appendix

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