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websites
http//webphysics.davidson.edu/course_material/py2
30l/optics/lenses.htm
http//www.phys.hawaii.edu/teb/optics/java/clens/
http//www.shermanlab.com/science/physics/optics/T
hinLens.php
http//phet.colorado.edu/simulations/sims.php?sim
Geometric_Optics
http//www.phys.ufl.edu/phy3054/light/lens/applet
s/divlens/Welcome.html