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Homework Help: Camera Lens Problem

  1. Feb 4, 2010 #1
    The actual frame size of "35-mm" film is 24 mm x 36 mm. You want to take a photograph of your friend, who is 1.70 m tall. Your camera has a 60.0 mm focal length lens. How far from the camera should your friend stand in order to produce a 36.0 mm-tall image on the film?

    i thought you would use the equation hi=-(f/do-f)ho

    I did this and i got 22.4 cm. which is wrong. please help im stuck
  2. jcsd
  3. Feb 5, 2010 #2


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    Homework Helper

    Your formula is correct.
    Convert all lengths to meter and find do.
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