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Convex lens problem

  1. Dec 20, 2015 #1
    A screen is placed 90cm from a object. The image of the object on the screen is formed by a convex lens at
    two different locations separated by 30cm. The focal length of the lens is what?
     
  2. jcsd
  3. Dec 20, 2015 #2

    Mister T

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    Science Advisor

    You can't just post a homework question and expect to get a response here. Start another thread, use the template, and show some effort towards a solution. You get help here, not answers.
     
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