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focus

focus

68 5.1
The central point where light rays meet
  • noun
  • /ˈfoʊkəs/
  • Specialized
translation icon : foco
  • The scientist adjusted the telescope to find the perfect focus on the distant star.
  • prime focus
  • focus at infinity

So it's like where the center focus of each lens is.

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Examples

  • Through the 2000s, NNPS school librarians sharpened their focus on student learning.

    Academic text (2013)
  • In optics, a lens can bend light to create a sharp focus on a specific point.

  • This concern will be the focus of my comments today.

  • That is our focus in looking at the market.

  • We know that students' learning is the central focus of good teaching.

    Academic text (2011)
  • First, the behavior of Southern white women is the central focus of this project.

    Academic text (2013)
  • So all the rays will come to a focus somewhere around there.

  • What is the focus of psychological health?

  • In the Greek hunt, the figures define the landscape and are the focus of our attention.

    Academic text (1999)
  • Originally, the showcases were conceived with a focus on the science unit being studied.

    Academic text (1993)

Synonyms

center of attention
vsfocus
  • Informal
29 3.2

A person or thing people notice most in a group

is the physical or energetic central point rather than a social attention center
focal point
vsfocus
  • Specialized
1 4.4

The point where rays of light come together after passing through a lens

is a general central point for light, energy, or activity rather than only optics
nidus
vsfocus
  • Specialized
1 9.9

A place in the body where an infection starts

is broader, meaning any central point where energy, activity, or light converge

Antonyms

17 5.2

The spreading of things over a wide area, for example seeds or people

2 6.7

A movement away from a common point, like rivers branching from a main channel

Idioms

18 3.3

Clear and easy to see or understand when people pay attention to it

Compounds

Strong, steady attention that shows determination

How Central

epicenter
  • Specialized
44 6.5
nucleus
8 6.3
focus
  • Specialized
68 5.1
center
  • US
679 1.0
area
1.0
periphery
27 6.5

Surface Forms

focus singular
focuses plural
foci plural

Etymology

Focus comes from an old Latin word focus meaning 'hearth' or 'fireplace', the warm center where light and heat come from. So, just like a home fire is a central point of light, a focus in optics is the central point where rays meet.