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Homework Help: Where to place a thin lens to couple a ray into a fiber

  1. Jul 4, 2015 #1
    1. The problem statement, all variables and given/known data
    i need to couple a ray (point source 15 deg) into a fiber with a small core diameter, the fiber located 8cm from the source.
    the focal distance of the lens is 1.5cm
    i need to choose 2 possible locations

    2. Relevant equations

    3. The attempt at a solution
    first suggestion:
    i placed the lense in the focal distance from the fiber

    second suggestion:
    i placed the lense in the middle between the source and the fiber (in this location the transverse magnification equal to -1 meaning that the point source will not get bigger,

    am i correct?
  2. jcsd
  3. Jul 4, 2015 #2


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    Staff Emeritus
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    Neither of those locations seems correct to me. The central location is an especially poor choice.

    How are the focal length, the object distance, and the image distance all related?
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