Tuesday, 10 July 2018

PARABOLA NOTE BY PLANCESS

In mathematics, a parabola is a plane curve which is mirror symmetrical and is approximately U shaped. It fits any of several superficially different mathematical descriptions, which can all be proved to define exactly the same curves.

Parabolas have the property that, if they are made of material that reflects light, then light which travels parallel to the axis of symmetry of a parabola and strikes its concave side is reflected to its focus, regardless of where on the parabola the reflection occurs. Conversely, light that originates from a point source at the focus is reflected into a parallel ("collimated") beam, leaving the parabola parallel to the axis of symmetry. The same effects occur with sound and other forms of energy. This reflective property is the basis of many practical uses of parabolas.

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