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Saturday, 21 September 2013
convex and concave lens
http://www.passmyexams.co.uk/GCSE/physics/concave-lenses-convex-lenses.html
http://researchthetopic.wikispaces.com/What+are+concave+and+convex+lenses%3F+Part+2
http://www.reference.com/motif/health/how-do-concave-and-convex-lenses-work
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