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Optics diagram, 13th century. The diagram at lower right (see C022/5625) shows light from the Sun (left) being refracted and focused by a spherical lens. The text is in Latin. This folio page is part of a collection of manuscripts by a number of authors, gathered by English natural philosopher Roger Bacon (c.1214-1292). It is thought that this diagram is by English scholar Robert Grosseteste (c.1175-1253) as part of his 'De natura locorum'.
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