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For large angular magnification of refracting telescope, it has an objective lens of

Options

  1. Asmall focal length and large diameter.
  2. Blarge focal length and large diameter.
  3. Clarge focal length and small diameter.
  4. Dsmall focal length and small diameter.

Correct answer

B. large focal length and large diameter.

Step-by-step solution

Angular magnification of astronomical refracting telescope in normal adjustment is given as m= f₀ f_e where, f₀ and f_e are focal lengths of objective and eyepiece. Hence, for large angular magnification of refracting telescope, it has an objective lens of large focal length and large diameter.

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