Metarefraction.svg - Wikipedia

Summary

Description Metarefraction.svg	An incident electromagnetic wave from free space entering a material at the boundary indicated by the lower left arrow refracts as shown by the solid upper right arrow when entering a conventional material and as shown by the dashed lower right arrow when entering a left-handed metamaterial.
Date	28 April 2007
Source	http://www.grc.nasa.gov/WWW/RT/2003/5000/5620wilson.html
Author	Dr. Jeffrey D. Wilson (uploader Tooto )

(note, updated to show arrow heads)

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