Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsA Double Parabola with Retroreflection Propertieshttp://demonstrations.wolfram.com/ADoubleParabolaWithRetroreflectionProperties/]]>http://demonstrations.wolfram.com/ADoubleParabolaWithRetroreflectionProperties/Reflection of Parallel Rays by a Two-Dimensional Body of Nearly Maximal Resistancehttp://demonstrations.wolfram.com/ReflectionOfParallelRaysByATwoDimensionalBodyOfNearlyMaximal/]]>http://demonstrations.wolfram.com/ReflectionOfParallelRaysByATwoDimensionalBodyOfNearlyMaximal/