A Cassegrain telescope uses two mirrors as shown in the above figure. Such a telescope is built with the mirrors $20mm$ apart. If the radius of curvature of the large mirror is
A Cassegrain telescope uses two mirrors as shown in above figure. Such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of the large mirror is
Cassegrain Telescope, Types of Telescopes Part 3 | OPT Telescopes
File:Cassegrain-Telescope.jpg - Wikimedia Commons
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