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Focal length
Meaning
Noun
●
In Optics:
A
measure
of how
strongly
an
optical
system
converges
or
diverges
light
, the
inverse
of
optical power
. In the
simple
case of a
single
convex lens
, it is the
distance
along the
optical axis
from the
principal
plane
of the
lens
to the
lens
's
focal point
(where,
for instance
, the
film
would be
placed
in a
camera
). For more
complex
or multi-element
optical
systems,
focal length
need not
correspond
to any
obvious
measurable
physical
distance
.
Sourced from
Wiktionary
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