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What are the advantages of using a refle...

What are the advantages of using a reflecting telescope?

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(i) The main adavantage is reflector telecope can escape from chromatic aberration because wavelenght does not effect reflection.
(ii) The primary mirror is very stable because it is located at the back of the telesope and can be support in the back.
(iii) More cost effective than refractor of similar size.
(iv) Easier to make a high quality mirror than lens because mirror need to only concern with one side of the curvature.
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