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An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

Options

  1. Alarge focal length and large diameter
  2. Blarge focal length and small diameter
  3. Csmall focal length and large diameter
  4. Dsmall focal length and small diameter

Correct answer

A. large focal length and large diameter

Step-by-step solution

For astronomical refracting telescope Angular magnification is more for large focal length Of objective lens M . P = f 0 f e Resolving power = D 1.22 λ Resolving power is high for large diameter. So, objective lens should have large focal length (f.) and large diameter D

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