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July 14th, 2012, 03:19 AM   #1
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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?
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July 14th, 2012, 05:47 PM   #2
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Re: What is directrix line of parabola used for?

Quote:
Originally Posted by pionixstar90
What about the directrix line? Is there any example of its application?
It's used for the cable of a suspension bridge or high tension power line; other uses are similar; example ski lifts or suspended gondolas.
Undersea tunnels or fiber optic cables.
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July 15th, 2012, 05:07 AM   #3
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How is it related to undersea tunnels?
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July 15th, 2012, 05:22 AM   #4
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Re: What is directrix line of parabola used for?

Ground water seepage
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February 21st, 2013, 08:19 PM   #5
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Re: What is directrix line of parabola used for?

Quote:
Originally Posted by pionixstar90
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?
To construct the parabola?

http://quadrivium.info/GGB/ParabRhombus.html
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