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Homework Help: Electromagnetic Radioation Optics

  1. Jan 11, 2015 #1
    • User informed about mandatory use of homework template.
    A convex mirror has a focal length of 16cm. How far behind the mirror does the image of a person 3.0m away appear?

    I've tried using the equation
    1/f = 1/do + 1/di

    The answer to the solution is -15cm but I'm not sure how to get there. I'm thinking that it might have something that deals with theory to solve this.
  2. jcsd
  3. Jan 11, 2015 #2


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    Hi AndrewTT and welcome to PF!

    As you can read in our guidelines, you need to provide a little more information on your attempt. For example:
    What did you get when you tried to use this?
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