ley. ISBN 0-321-18878-0.Greivenkamp, John E. (2004). Field Guide to Geometrical Optics. SPIE Field Guides vol. FG01. SPIE. ISBN 0-8194-5294-7.බාහිර සබැඳුම්[සංස්කරණය]Lens හා සබැඳි මාධ්‍ය විකිමාධ්‍ය කොමන්ස් හි ඇත.Thin lens simulationApplied photographic optics BookBook- The properties of optical glassHandbook of Ceramics, Glasses, and DiamondsOptical glass constructionHistory of Optics (audio mp3) by Simon Schaffer, Professor in History and Philosophy of Science at the University of Cambridge, Jim Bennett, Director of the Museum of the History of Science at the University of Oxford and Emily Winterburn, Curator of Astronomy at the National Maritime Museum (recorded by the BBC).a chapter from an online textbook on refraction and lenses සංරක්ෂණය කළ පිටපත 2009-12-17 at the Wayback MachineThin Spherical Lenses  on Project PHYSNET.Lens article at digitalartform.com සංරක්ෂණය කළ පිටපත 2016-03-04 at the Wayback MachineArticle on Ancient Egyptian lensespicture of the Ninive rock