元となった辞書の項目
Fermat's principle
name
The
link
between
ray
optics
and
wave
optics,
stating
(in
its
original
strong
form)
that
the
path
taken
by
a
ray
between
two
given
points
is
the
path
that
can
be
travelled
in
the
least
time,
or
(in
a
weaker
form
that
is
true
for
all
cases)
in
a
time
that
is
"stationary"
with
respect
to
variations
of
the
path
—
so
that
a
deviation
in
the
path
causes,
at
most,
a
second-order
change
in
the
traversal
time.
意味（1）
The
link
between
ray
optics
and
wave
optics,
stating
(in
its
original
strong
form)
that
the
path
taken
by
a
ray
between
two
given
points
is
the
path
that
can
be
travelled
in
the
least
time,
or
(in
a
weaker
form
that
is
true
for
all
cases)
in
a
time
that
is
"stationary"
with
respect
to
variations
of
the
path
—
so
that
a
deviation
in
the
path
causes,
at
most,
a
second-order
change
in
the
traversal
time.
