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Question 20233
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Ray Optics: Telescope — Magnification MCQ

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Telescope — MagnificationMediumQuestion 20233

Question

Magnifying power of an astronomical telescope (objective f_o, eyepiece f_e) for relaxed eye:
  1. A
    f_o/f_e
    Correct
  2. B
    f_e/f_o
  3. C
    (f_o + f_e)/f_e
  4. D
    f_o × f_e

Correct answer

f_o/f_e

Explanation

M = f_o/f_e. Large objective focal length (large aperture) and small eyepiece focal length → high magnification. Image is inverted.

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