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How far is the object from the mirror and what is the curvature?

  1. Apr 27, 2009 #1
    1. The problem statement, all variables and given/known data

    An object is placed 15cm from a certain mirror, the image is half the size of the object, upright, and virtual. how far is the image fromt he mirror, and what is the radius of curavature of the mirror?

    2. Relevant equations
    1/f = 1/p + 1/q

    f= r/2


    3. The attempt at a solution
    1/f = 1/p + 1/q
    1/15= 1/-7.5

    1/q = 1/5cm

    f= r/2
    r=f*2
    15*2= 30cm
     
  2. jcsd
  3. Apr 27, 2009 #2

    rl.bhat

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    Re: lense

    1/f = 1/p + 1/q
    1/15= 1/-7.5
    This step is wrong.
    It should be
    1/f = 1/p + 1/q
    1/f = 1/15 + 1/-7.5
     
  4. Apr 27, 2009 #3
    Re: lense

    so base on what was corrected the answer is -1/15cm is how far is the image from the mirror, and what is the radius of curavature of the mirror is f= r/2
    r=f*2
    -1/15*2= -2/15cm?
     
  5. Apr 27, 2009 #4
    Re: lense

    oh i mean -30cm for r
     
  6. Apr 27, 2009 #5

    rl.bhat

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    Homework Helper

    Re: lense

    Yes.
     
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