On-line Dictionary
Refraction
Refraction
n.
The
act
of
refracting
, or
the
state
of
being
refracted
.
Refraction
n.
The
change
in
the
direction
of
ray
of
light
,
heat
, or
the
like
,
when
it
enters
obliquely
a
medium
of a
different
density
from
that
through
which
it
has
previously
moved
.
Refraction
n.
The
change
in
the
direction
of a
ray
of
light
,
and
,
consequently
, in
the
apparent
position
of a
heavenly
body
from
which
it
emanates
,
arising
from
its
passage
through
the
earth
's
atmosphere
;
hence
distinguished
as
atmospheric
refraction
, or
astronomical
refraction
.
Refraction
n.
The
correction
which
is to be
deducted
from
the
apparent
altitude
of a
heavenly
body
on
account
of
atmospheric
refraction
, in
order
to
obtain
the
true
altitude
.
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