Focal point

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A focal point may mean the same as focus. It may also mean:

focus (optics) is the point at which initially collimated rays of light meet after passing through a convex lens, or reflecting off of a concave mirror.
In mathematics, focal point means a critical point of a distance function.
In an antenna (electronics):
* The driven element, directly connected to the transmission line or source
* The passive radiator
In game theory, a Schelling point is an equilibrium more likely to be chosen by the players because it seems special, natural or relevant to them.

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