An astronomical refracting telescope will have large angular magnification and high angular resolution, when…

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
  1. large focal length and large diameter
  2. large focal length and small diameter
  3. small focal length and large diameter
  4. small focal length and small diameter

Solution

For astronomical refracting telescope
Angular magnification is more for large focal length
Of objective lens M.P=f0fe
Resolving power =D1.22λ
Resolving power is high for large diameter.
So, objective lens should have large focal length (f.) and large diameter D

Asked in: NEET 2018

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