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Homework Help: Final exam help!

  1. Jun 22, 2005 #1
    Woo, this is on my final exam and i dont know if theres a formula or something to solve it. really need help. anything is appreciated.

    A converging lens with a focal length of 15.0 cm is placed 53 cm from a light bulb. Where would you place a screen to focus an image of the object? :uhh:
     
  2. jcsd
  3. Jun 22, 2005 #2
    click the link below to see a drawing. do you recall how to apply the formula below from your textbook?

    http://img31.echo.cx/img31/1521/img12642ah.png

    [tex] \frac{1}{p} \ + \ \frac{1}{q} \ = \ \frac{1}{f} [/tex]
     
  4. Jun 22, 2005 #3
    In case those variables were confusing, I rewrote them.

    [tex]\frac{1}{d_i} + \frac{1}{d_0} = \frac{1}{f}[/tex]

    d_0 = object distance
    d_i = image distance
    f = focal length
     
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