"The effective inventor of the telescope and compound microscope was Galileo... Galileo's account of the path of the rays through the concave eye-piece and convex objective which he used was not satisfactory and was considerably improved by Kepler, who suggested the use of two convex lenses which became the basis of later instruments. Kepler had already written an important optical treatise in the form of a commentary on Witelo's Perspectiva... His improvements to the telescope may be regarded as what he had learned from the thirteenth-century writer."
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Original Language: English
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A.C. Crombie, Robert Grosssteste and the Origins of Experimental Science (1953)
https://en.wikiquote.org/wiki/Johannes_Kepler
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