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An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
Explanation
Magnification ∝ $f_0$ and resolving power ∝ D of the objective.
Detailed Solution
For a telescope, angular magnification $= \frac{f_0}{f_E}$
So, focal length of the objective lens should be large.
Angular resolution $= \frac{D}{1.22\lambda}$ should be large.
So, the objective should have large focal length ($f_0$) and large diameter D.