Definition of Focal distance, or length, of a lens or mirror
(Opt.)
the
distance
of
the
focus
from
the
surface
of
the
lens
or
mirror
,
or
more
exactly
,
in
the
case
of
a
lens
,
from
its
optical
center
.
See also:
Focal
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flytrap
flywheel
Fm
fnese
FNMA
Fo
fo'c'sle
Foal
Foal teeth
Foalfoot
Foam
Foam cock
foaming
foamingly
foamless
foamy
Fob
Fob chain
Focal
Focal distance of a telescope
Focalization
Focalize
Focillate
Focillation
Focimeter
Focus
Focus tube
focused
focusing
focussed
Fodder
Fodderer
Fodient
Fodientia
Foe
Foehn
Foehood
Foeman
Foetal
Foetation
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