Mirrors absorb and transmit light. This article from wiki explains what a perfect mirror would be: http://en.wikipedia.org/wiki/Perfect_mirror http://en.wikip

Mirrors absorb and transmit light. This article from wiki explains what a perfect mirror would be: http://en.wikipedia.org/wiki/Perfect_mirror http://en.wikipedia.org/wiki/Perfect_mirror I believe the most important part of the article is: "The team then ran light beams through the lattices and confirmed that they could flow light (without loss) through turns that are twice as tight as any done previously." If you can bend light without loss, I imagine that is very valuable. All that said, IANAP (I am not a physicist) so if someone else can correct me or add more information, I'm sure that would be helpful.