Images of the Mirrors
Caption: Ball Aerospace Technician Robin Russell inspects the Webb Telescope Aft Optics Subsystem during mirror integration activities. The Aft Optics bench, made of lightweight beryllium like the mirrors, holds Webb's tertiary and fine steering mirrors. The installed, gold-coated tertiary mirror can be seen in the background.
Read more: http://www.nasa.gov/mission_pages/webb/news/aft-optics.html
Credit: Ball Aerospace