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Homework Help: Focal length of a plane glass

  1. Oct 12, 2014 #1
    1. The problem statement, all variables and given/known data
    what is the focal length of a plane glass ?

    2. Relevant equations

    3. The attempt at a solution
    place a plane glass in a plane and allow light to pass through it measure its focal length
    (i think its focal length is infinite )
  2. jcsd
  3. Oct 12, 2014 #2


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    Science Advisor
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    Hello Hafiz, and welcome to PF.
    This is homework of the kind that lets you think instead of calculate. You think its infinite, which is more or less a result. How do you come to this conclusion ?
  4. Oct 12, 2014 #3
    You are correct Hafiz, the focal length of a plane mirror is near to infinite. That's why we say that the power of ZERO.
    But we encourage you to write the methodology of deriving solution while posting a question. It help other a lot to understand the correct question.
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