Webb's Mirrors - NASA Science
science.nasa.gov
Webb is what is known as a three mirror anastigmat telescope. In this configuration, the primary mirror is concave, the secondary is convex, and it works
The original post: /r/todayilearned by /u/zahrul3 on 2025-04-10 07:15:03.

Original Title: TIL the mirrors on the James Webb Space Telescope took 9 years to make, with the first blanks being made in 2004, and all mirror segments being finally delivered to the site of final assembly in 2013.