Discussion
What is the effective focal length of a Cassegrain compared with its physical depth?
Answer: D
The hyperboloid magnifies the effective focal length, so a physically compact structure behaves optically like a very long dish, which improves scan performance and cross polarisation. That magnification is the main reason for the arrangement beyond feed accessibility. The path length and the effective focal length are different quantities, which is why the third option is a natural but wrong intuition, and feed position is fixed by the design rather than free.
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