Teacher2Teacher 
Q&A #6268 
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From: Loyd To: Teacher2Teacher Public Discussion Date: 2001072318:21:07 Subject: Re: Parabolas Parabolas are used as flashlight reflectors, radar antennas, headlight reflectors. In a parabola you place the radar or microwave antenna or the light bulb at the focal point and all the light that leaves the focal point is reflected so that all the rays are parallel to each other. Thus you have a beam of light. Sometimes antennas and reflectors are a spherical section, but when the section is small in relation to the sphere, it will approximate a parabola. Most Algebra II books have a section on conic sections and this includes parabolas.
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