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Mirrors and Lens Question

  1. Sep 2, 2013 #1
    1. A stamp collector uses a converging lens with focal length 32 cm to view a stamp 17 cm in front of the lens.

    Where is the image located?
    a. in front of the lens (real image)
    b. behind the lens (virtual image)


    2. 1/f = 1/do + 1/di


    3. 1/32 = 1/17 + 1/di
    di = -32.267 cm

    Because it's negative it is a virtual image.

    For this problem, I imagined

    front behind
    ---f--do---lens-----------

    A virtual image is in the same side as the object. So something like this:
    http://www.pa.msu.edu/courses/2000fall/PHY232/lectures/lenses/virtual_image.gif


    So then why does the answer say if its virtual it is behind the lens? Also, what is considered front/behind for lens/mirrors?
     
  2. jcsd
  3. Sep 2, 2013 #2
    I think it is referring to the viewer. Behind the lens for the viewer is in front for the lens.
     
  4. Sep 7, 2013 #3
    Thank You!
     
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