As a noun terms
is .
As an adjective afocal is
(optics|of an imaging system) not focused.
terms
English
Noun
(head)
Statistics
*
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afocal
English
Adjective
(-)
(optics, of an imaging system) Not focused
(optics, of a lens) Neither concave or convex (focal point at infinity)
Derived terms
* afocality
* afocally