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All about lenses
visit http://goes.flexinet.com.au/default.htm
compiled by Mr GJuly 2008
http://www.heussneroptics.com/Convex%20Lenses%20-%20Icon.jpg
Describe the shape of typical convex lenses
How are convex lenses used?
http://i.pbase.com/u40/tkt/large/40599248.LighthouseLamp.jpg
http://images.asia.ru/img/alibaba/photo/51637706/Microscope.jpg