Objective: Determine the radius of curvature of various watch glasses.
From the height h of a spherical surface above a point on a plane defined by the corners of an equilateral triangle, the radius of curvature R of the spherical surface may be determined. This can be done for both convex and concave curvatures of the sphere.
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![一套10个可视玻璃器皿，直径120毫米, 1002869 [U14201], 玻璃制品](/thumblibrary/U14201/U14201_01_140_140_一套10个可视玻璃器皿-直径120毫米.jpg)
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![直流电源0 – 20 V, 0 – 5 A
(230 V, 50/60 Hz), 1003312 [U33020-230], 供电器](/thumblibrary/U33020-230/U33020-230_01_140_140_直流电源0-20-V-0-5-A-230-V-5060-Hz.jpg)
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