"cén focal atá i gceist" means "which word is in question"
Focal Point:The distance from the Lens to the Focal Point is called the Focal Point.
The focal point of a circle is the center.
the focal length of most binoculars is .50
The focal point of the exhibition was the work by Colin Maccahon
Wide-angle lenses have a short focal length. The focal character of my short story is a ten-year-old boy.
The focal point of the speech was the atom, yet we kept talking about potato chips and their flavor.
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The lily pond at its focal point with the most beautiful water lilies.
the prefix for focal is infocals
focal length of the lens
In art a composition's focal point is actually called the focal point. There may be multiple focal points, in which case the main one is the focal point and the others are secondary focal points. You can recognize the focal point because it is somehow set apart from the rest of the composition.
It does not. For an explanation of "focal plane" see the question What is the focal plane?