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Locate the position of the image.

  1. Jul 13, 2009 #1
    1. The problem statement, all variables and given/known data

    A diverging lens has a focal length of 15.7 cm.
    An object 1.91 cm in height is placed 380 cm
    in front of the lens.

    Locate the position of the image. Answer
    in units of cm.

    2. Relevant equations

    (1/f)= (1/p)+(1/i)

    3. The attempt at a solution

    1/[(1/-15.7)-(1/1.91)]= i , i = -1.70284
    i solved this way but i keep on getting the wrong answer dunno why
     
  2. jcsd
  3. Jul 13, 2009 #2

    andrevdh

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    Homework Helper

    o = 380 cm
     
  4. Jul 13, 2009 #3
    what ???
    i didnt get it
     
  5. Jul 13, 2009 #4

    andrevdh

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    Homework Helper

    Sorry, you use a p, so p = 380 cm
     
  6. Jul 13, 2009 #5
    To clarify, you're using the object height when you should be using the object distance from the lens.
     
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