focal point
noun
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.
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.
the central or principal point of focus.
Origin of focal point
First recorded in 1705–15
Words nearby focal point
Example sentences from the Web for focal point
We are at the focal-point of the present battle in Foureaux Wood (near Guillemont).
Now It Can Be Told |Philip Gibbs
British Dictionary definitions for focal point
focal point
noun
Also called: principal focus, 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
a central point of attention or interest
Medical definitions for focal point
focal point
n.
focus
Scientific definitions for focal point
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