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Question

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

A
Large focal length and large diameter
B
Small focal length and large diameter
C
Small focal length and small diameter
D
Large focal length and small diameter
Solution
Verified by Toppr

Angular magnification = - fofe
Resolution D
Hence for an astronomical refracting telescope having larger focal length and larger diameter for large angular magnification and high resolution.

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