Focal point

A focal point may mean the same as focus.

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Elements of an antenna:

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• driven element
• parasitic element.

The driven element is directly connected to the transmission line or source.

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In mathematics, focal point has a meaning of a critical point of a distance function.

Related Topics:
Mathematics - Critical point - Distance function

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In optics, a focal point is the point in which all the rays of light meet after passing through a convex lens, or reflecting off of a concave mirror.

Related Topics:
Optics - Convex lens - Mirror

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