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Celestron CGX 8 Inch Schmidt-Cassegrain Telescope - 12050 - Telescopes at Telescopes
A Cassegrain telescope uses two mirrors as shown in above figure. Such a telescope is built with the mirrors 20mm apart. If the radius of curvature of the large mirror is 220mm
In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
Cassegrain Telescope, Types of Telescopes Part 3 | OPT Telescopes