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July 14th, 2012, 03:19 AM  #1 
Newbie Joined: Nov 2011 Posts: 3 Thanks: 0  What is directrix line of parabola used for?
As I understand, a focus point of parabola is used for locating a focus point of a signal when we design an antenna. What about the directrix line? Is there any example of its application? 
July 14th, 2012, 05:47 PM  #2  
Senior Member Joined: Jun 2011 Posts: 298 Thanks: 0  Re: What is directrix line of parabola used for? Quote:
Undersea tunnels or fiber optic cables.  
July 15th, 2012, 05:07 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,469 Thanks: 2038 
How is it related to undersea tunnels?

July 15th, 2012, 05:22 AM  #4 
Senior Member Joined: Jun 2011 Posts: 298 Thanks: 0  Re: What is directrix line of parabola used for?
Ground water seepage

February 21st, 2013, 08:19 PM  #5  
Banned Camp Joined: Feb 2013 Posts: 224 Thanks: 6  Re: What is directrix line of parabola used for? Quote:
http://quadrivium.info/GGB/ParabRhombus.html  

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directrix, line, parabola 
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