A 2.4-meter primary mirror for a space telescope

The 2.4-meter primary mirror for the Space Telescope is lifted from the vacuum chamber, where it was coated with a reflective layer of aluminum and an overcoating layer of magnesium fluoride (to preserve reflectivity in the uv). The mirror quality is expected to lead to a telescope with an rms error of  lambda/20 at 6328A; this value is essentially diffraction limited. (Typical ground-based telescopes are usually figured to no better than lambda/10.), Credit Line: Perkin-Elmer Corporation, courtesy AIP Emilio Segrè Visual Archives, Physics Today Collection
Abstract/Description: The 2.4-meter primary mirror for the Space Telescope is lifted from the vacuum chamber, where it was coated with a reflective layer of aluminum and an overcoating layer of magnesium fluoride (to preserve reflectivity in the uv). The mirror quality is expected to lead to a telescope with an rms error of lambda/20 at 6328A; this value is essentially diffraction limited. (Typical ground-based telescopes are usually figured to no better than lambda/10.)
Subject(s): Telescopes
Equipment and supplies
Telescopes
Date Created: circa 1981
Credit Line: Perkin-Elmer Corporation, courtesy AIP Emilio Segrè Visual Archives, Physics Today Collection
Catalog ID: Telescopes F19