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Two concave lenses, of focal lengths 500 mm and 20 mm, are used in the construction of a telescope. Given any potential arrangement, what is the largest possible magnification the telescope may have?
  1. 100x
  2. 10,000x
  3. 25x
  4. 4x
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OpenStax College Physics for AP® Courses Solution, Chapter 26, Problem 11 (Test Prep for AP® Courses) (0:19)

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This is College Physics Answers with Shaun Dychko. The angular magnification of a telescope is the ratio of the objective focal length to the eyepiece focal length. So, that's negative 500 millimeters divided by 20 millimeters, which is 25, so the answer is C.