Discussion
Cassegrain telescope is advantageous because it
Answer: D
The Cassegrain telescope provides a large focal length in a short telescope.
In a Cassegrain reflector, light from the concave primary mirror is reflected back by a convex secondary mirror through a hole in the primary. The convex secondary increases the effective focal length, while folding the light path keeps the tube short. A long focal length gives high magnification without a very long instrument.
The options with a short focal length reverse the advantage, and 'large focal length in large telescope' misses the point that the design keeps the tube compact.
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