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Stanhope lens

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Stanhope lens [′stan‚hōp ‚lenz]
(optics)
A thick biconvex lens with front and back surfaces having radii of curvature of two-thirds and one-third the lens thickness; used as a magnifier by placing the object to be viewed in contact with the front surface.


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The actual Stanhope lens was invented by Charles, 3rd Earl Stanhope, (1753-1816) but he died many years before his invention was used in the manufacture of novelty souvenirs.
He combined the Stanhope lens with a microphotograph to forma single miniature magnifying unit, which he patented in 1859.
 
 
 
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