Keywords: Optics from Roger Bacon's De multiplicatone specierum.jpg but the British Library cannot accept responsibility for any errors that may occur A C Crombie Robert Grosseteste and the Origins of Experimental Science Fig 2 describes this diagram as follows Diagram illustrating Grosseteste's theory in De Nat Loc see pp 122 149 of the focusing of the sun's rays by a spherical lens; from Roger Bacon's Opus Maius iv ii 2 MS Roy 7 F viii f 25v Apparently based on Crombie Colin A Ronan The Cambridge illustrated history of the world's science 1983 attributes the image to Grosseteste's De natura locorum Adapted from http //www imagesonline bl uk/britishlibrary/controller/textsearch text bacon y 0 x 0 startid 32112 width 4 height 2 idx 2 PD-Art 13th-century illuminated manuscripts Medieval science Refraction Roger Bacon Illuminated manuscripts in the British Library British Library Royal Manuscripts Artworks missing infobox template |