All 10 Uses of

focus
in
The Andromeda Strain

In a moment, the image came into focus, green and black on the screen.†
Chpt 22 *

focus = a state where something has come into view or can be seen clearly

They watched as the viewer automatically moved around the capsule, focusing on the surface of the metal.†
Chpt 15 *

When the screens came back into focus, they were looking at the indentation, and the black fleck with the green areas.†
Chpt 15

In principle, the electron microscope was simple enough: it worked exactly like a light microscope, but instead of focusing light rays, it focused an electron beam.†
Chpt 22

In principle, the electron microscope was simple enough: it worked exactly like a light microscope, but instead of focusing light rays, it focused an electron beam.†
Chpt 22

Definitions:

(1) (focus as in: Turn your focus to question #2.)
verb: to concentrate, look at, or pay attention to

noun: the act of concentration, or the ability to concentrate

(to concentrate is to direct attention or effort towards a single thing)
(2) (focus as in: The focus of our study is...)
where attention is concentrated or directed
(3) (focus as in: bring into focus; or out of focus)
a state where something has come into view or can be seen clearly; or an adjustment made to permit a clear view
(4) (focus as with technical usage)
technical usage typically involves some sense of center or concentration such as:
- physics — a point where things come together such as the point where light rays meet
- geometry — a fixed reference point (as of a parabola)
- geology — the point of origin of an earthquake
See a comprehensive dictionary for other less common meanings.