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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. A
    small focal length and large diameter
  2. B
    large focal length and small diameter
  3. C
    large focal length and large diameter
  4. D
    small focal length and small diameter
View Answer & Solution

Correct answer · Option C

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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