LENS, DOUBLE CONVEX
From optically worked plate glass. Useful for student optical experiments. Focal length 5, 10, 12, 15, 20, 25, 30, 40, 50, and 100. Diameter:
LENS, DOUBLE CONCAVE
From optically worked plate glass. Diameter focal length as in 1451.
LENSES, SET OF SIX
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