What problem do refractor telescopes have that reflectors do not?

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Tags

1. #reflector
2. #refractor
3. #optical
4. #involves
5. #mirror
6. #concave
7. #reflectors
8. #elimination
9. #major
10. #surface
11. #chromatic
12. #telescopes
13. #design
14. #aberration
15. #newtonian
16. #problem
17. #advantage