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Spherical mirrors (concave), easy plug in chug, but i f'ed it up!

  1. Mar 13, 2006 #1
    Hello everyone, I tried a problem on concave mirros and i have no idea why this is wrong. I was given enough info but still didn't like it. Here is the problem:
    Spherical mirrors. Object O stands on the central axis of a spherical mirror. The table gives object distance p, the type of mirror, and focal distance f. Find the image distance i and the lateral magnification m of the object, including signs.

    p (cm) = +25
    Mirror = concave
    f (cm) = *17

    Find i(cm) and m.

    Idon't know what the *17 means though! I just took it as a the foocal distance f = 17cm.

    http://suprfile.com/src/1/69173g/lastscan.jpg [Broken]

    Any idea where i f'ed it up? thanks!
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Mar 13, 2006 #2


    User Avatar

    Check your math. 1/4 + 1/4 does not equal 1/8.
  4. Mar 13, 2006 #3
    Ahh thanks Eep, either i drank too much coffee or not enough hah.
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