I asked the Author to release such an image for the Public Domain,
in order to post it at Wikipedia, and I just got his permission,
together with this picture.
The copyright holder of this file allows anyone to use it for any purpose, provided that the copyright holder is properly attributed. Redistribution, derivative work, commercial use, and all other use is permitted.
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== Summary == Author: Ueda This is historical picture of the first active mirror. The detailed desctiption is at <ref>{{cite web| work=| url=http://bookstore.spie.org/index.cfm?fuseaction=detailpaper&cachedsearch=1&productid=143686&producttype=pdf&CFID