Discussion
What is the purpose of a subreflector in a dual reflector antenna?
Answer: C
The subreflector redirects the converging wave back towards the vertex, giving a long effective focal length in a short physical structure and putting the feed and receiver where they can be reached. It adds blockage of its own, which is the price. It does not add collecting area, does not create a second beam, and weather protection is a radome's job. Folding a path to place equipment conveniently is the same idea telescope makers adopted centuries earlier.
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