Focus

Pronunciation
/FOH-kus/
Category
Optics, Vision
Singular
Focus
Plural
Focuses

Definition

The point or area where light rays converge in an optical system, such as an eye. In entomology, it may refer to the area in an insect's eye where light is focused to allow clear vision.

Etymology

From Latin 'focus', meaning 'fire'.

Example

The focus of an insect's compound eye is crucial for its ability to detect movement.

Related Terms