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Physics · PYQ NEET UG 2018

हिन्दी

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

  1. small focal length and large diameter
  2. large focal length and small diameter
  3. large focal length and large diameter
  4. small focal length and small diameter

Correct answer · Option 3

large focal length and large diameter

Explanation

Magnifying power \( m = \frac{f_o}{f_e} \) requires large \( f_o \), and resolving power \( R \propto \frac{D}{\lambda} \) requires large diameter \( D \).

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