Images of the Mirrors

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Caption: The Center Of Curvature Optical Assembly (COCOA) will allow the program to verify the optical performance of the 21.3-foot (6.5-meter) primary mirror at its 40 degrees Kelvin (-233 Celsius) operating temperature. The COCOA contains mechanical and optical instruments that allow the test team to identify, align and test the 18-segments from outside the vacuum chamber. Note: The background of this image has been digitally removed.

More information: http://www.nasa.gov/topics/technology/features/webb-cocoa.html

Credit: ITT Exelis