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QNEET-2018-Ph-882: NEET 2018 Physics - Class 12 NEET-2018-Ph-882 Solution: An astronomical refracting telescope will have large angular…
An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of small focal length and large diameter large focal length and small diameter large focal length and large diameter small focal length and small diameter
Multiple Choice Options
- A small focal length and large diameter
- B large focal length and small diameter
- C large focal length and large diameter
- D small focal length and small diameter
Step-by-Step Verified Solution
For telescope, angular magnification = f 0 f e , which
shows that focal length of objective lens to be large.
Angular resolution = D 1.22 _ which is large, hence
objective should have large focal length and larger
diameter.