This webpage from Clackamas Community College explains optical isomerism, primarily through photographs of molecular models. The photo shows an example of mirror image molecules that cannot be superimposed. Related webpages describe applications in chemistry.
Clackamas Community College. Structure and Optical Isomerism. Oregon City: Clackamas Community College, January 14, 2003. http://dl.clackamas.cc.or.us/ch106-05/optical.htm#top (accessed 4 October 2015).
%0 Electronic Source %D January 14, 2003 %T Structure and Optical Isomerism %I Clackamas Community College %V 2015 %N 4 October 2015 %8 January 14, 2003 %9 text/html %U http://dl.clackamas.cc.or.us/ch106-05/optical.htm#top
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