foci
Pronunciation:
/ˈfəʊ.kaɪ//ˈfoʊ.saɪ/noun
Definitions
A point at which reflected or refracted rays of light converge.
Example: The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.
A point of a conic at which rays reflected from a curve or surface converge.
The fact of the convergence of light on the photographic medium.
Example: Unfortunately, the license plate is out of focus in this image.
The quality of the convergence of light on the photographic medium.
Example: During this scene, the boy’s face shifts subtly from soft focus into sharp focus.