A Lack Of Rigor Leaves Students 'Adrift' In College

Interesting article:
http://www.npr.org/2011/02/09/133310978/in-college-a-lack-of-rigor-leaves-students-adrift

Diverging Lens

Diverging Lens
Try this diverging lens simulation from UF

Geometric Optics 2.04

Geometric Optics 2.04

Try the optics simulation from Phet.

Sound and Light Test Reviews on Blackboard