focal point

noun
1.
Also called principal focus. Optics. either of two points on the axis of a mirror, lens, or other optical system, one point being such that rays diverging from it are deviated parallel to the axis upon refraction or reflection by the system and the other point being such that rays parallel to the axis of the system converge to the point upon refraction or reflection by the system.
2.
the point at which all elements or aspects converge; center of activity or attention: The focal point of our discussion was the need for action.
3.
the central or principal point of focus.

Origin:
1705–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
focal point
 
n
1.  principal focus, Also called: focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection
2.  a central point of attention or interest

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

focal point n.
See focus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
focal point  
The point at which all radiation coming from a single direction and passing through a lens or striking a mirror converges. Also called focus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Although designed to focus solar energy towards a single focal point to boil a
  liquid and drive a steam generator.
Its of a wilderness landscape with a couple of stags for the focal point and
  deers.
The composition should naturally take a viewer's eyes to the focal point, but
  it is not the case with this photograph.
The arrest instantly became a new focal point in the long-running debate about
  how to restructure scholarly publishing.
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