Which of the following optical instruments are used in a Cassegrain telescope?
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
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![The Cassegrain telescope [14] | Download Scientific Diagram](https://www.researchgate.net/publication/344674371/figure/fig1/AS:946954573987843@1602782972909/The-Cassegrain-telescope-14.jpg "The Cassegrain telescope [14] | Download Scientific Diagram")
The Cassegrain telescope [14] | Download Scientific Diagram
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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
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