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NDA 2 2025 GAT, question 59

Topic: Physics

Q59

In a Telescope, compared to the eyepiece lens the objective lens has

  1. (a) larger focal length and larger apertureCorrect answer
  2. (b) larger focal length and smaller aperture
  3. (c) smaller focal length and larger aperture
  4. (d) smaller focal length and smaller aperture

Solution.

Answer: (a) larger focal length and larger aperture

  1. An astronomical telescope’s objective has a long focal length for magnification and a large aperture to collect light and improve resolution.
  2. The eyepiece has a shorter focal length.
  3. Thus both comparisons in (a) are correct.