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I need help with a parabola problem!

  1. Nov 27, 2007 #1
    This is my first post here so I hope I put it in the proper place.

    Here's the basic info on the question.

    parabolic reflector (like a tv dish) has diameter of 10cm, focus is 2 cm from the vertex. Find the depth.

    Thanks in advance for an help. I've been stuck on this for a while! Getting frustrated.
     
  2. jcsd
  3. Nov 28, 2007 #2

    HallsofIvy

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    First write down the equation for a parabola with y-axis a axis of symmetry, passing through (0,0), focus at (0, 2). Now, when x= 5, what is y?
     
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