The Webb telescope has 21 mirrors, with
18 primary mirror segments working together as one large 21.3-foot (6.5-meter)
primary mirror. The mirror segments are made of beryllium, which was selected
for its stiffness, light weight and stability at cryogenic temperatures. Bare
beryllium is not very reflective of near-infrared light, so each mirror is
coated with about 0.12 ounce of gold.
Image Credit: Ball Aerospace
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