Why do telescopes use mirrors instead of lenses?

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Tags

1. #cause
2. #build
3. #advantages
4. #easier
5. #combination
6. #mirrors
7. #because
8. #reflecting
9. #lenses
10. #large
11. #mount
12. #aberration
13. #mirror
14. #telescopes
15. #refracting
16. #attach
17. #cheaper
18. #chromatic