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
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In a reflecting telescope (Cassegrain), is there a difference between using a concave or convex secondary mirror? - Astronomy Stack Exchange
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In a Cassegrain telescope, which of the following mirrors is used as the secondary mirror?
Reflecting Telescope | Definition, Advantages & Disadvantages - Video & Lesson Transcript | Study.com
