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Camera lens problem

  1. Sep 1, 2008 #1
    the dimensions of the picture on a 35mm color slide are 24X36 mm,an image of the slide is projected on a screen 9.00 m from the projector lens.the focal length of projectorlens is 150mm.
    1-- how far is the slide from the lens
    2-- what are the image on the screen.

    Plz some body help me...i m not getting any clue
     
  2. jcsd
  3. Sep 1, 2008 #2

    Borek

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    Staff: Mentor

    Do you know lens formula? Do you know intercept theorem?
     
  4. Sep 1, 2008 #3
    yes lens formula is
    1/s + 1/s' = 1/ f
     
  5. Sep 1, 2008 #4

    Borek

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    Staff: Mentor

    Just look at what you know and what you need for the 1st part... Simple algebra.
     
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