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OpenStudy (anonymous):
A meniscus lens has an edge thickness of 5mm and a diameter of 40mm. If the sag of the convex surface is 1.2mm and the sag of the other surface is 2.4mm, what is the centre of thickness of the lens?
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OpenStudy (anonymous):
Sag is given by the following equation:\[s( r )=\frac{ r ^{2} }{ 2R }\]where s( r) is the sag at radial position, r; and R is the radius of curvature of the surface.
OpenStudy (anonymous):
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