Parabolic Light Reflectors

 

 

Watch these two parabolas reflect light to a single focus!

 

 

Definition of a parabola:  For a given point, called the focus, and a given line not through the focus, called the directrix, a parabola is the locus (set) of points such that the distance to the focus equals the distance to the directrix.

 

 

For background, the following is an example of a parabola:

 

 

 

 

 

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