A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 255
objects which are invisible to thenaked eye on account of their distance. 3. They magnifyobjects seen through them. 649. A double convex lens of glass, with sides equallyconvex, brings parallel rays passing through it to a focus atthe centre of the sphere, of which the surface of the lensfirst…
Physics
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