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How i can find the magnification of a lens?

  1. Dec 29, 2007 #1
    how i can find the magnification of a lens??

    how i can find the magnification of a lens if i don't know it's focal length??
     
  2. jcsd
  3. Dec 29, 2007 #2
    Just compare an original object and its (real or imaginary) image.
     
  4. Dec 29, 2007 #3
    what is the formula in finding the magnification?

    what is the formula in finding the magnification if i don't know the focal length?
     
  5. Dec 29, 2007 #4
    magnification M is

    M = SI / SO

    where

    SI is size of image
    SO is size of object
     
  6. Dec 29, 2007 #5
    if the lens is 4mm in diameter how i can find the magnification and focal length?
     
  7. Dec 29, 2007 #6
    magnification and focal length do NOT depend on diameter
     
  8. Dec 29, 2007 #7

    russ_watters

    User Avatar

    Staff: Mentor

    That doesn't tell you anything you need to know to find the focal length.
     
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