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Tool: Focus of parabola
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Go to: http://www.ies-math.com/math/java/conics/focus/focus.html (opens a new window)
Description: This applet illustrates the phenomena that parallel beams reflect on the parabola face and gather at one point. The point is the focus of parabola. Using the applet, investigate the relationship between the position of the focus and the shape of the parabola.
Technology Type: Java Applet 
Author: International Education Software: Manipula Math
Language: English 
Cost: Does not require payment for use

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Courses: Algebra II Parabolas
PreCalculus foci