Last Updated：2025/12/07
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.
音声機能が動作しない場合はこちらをご確認ください
See correct answer
Fermat's principle
Edit Histories（0）
Source Word
Fermat's principle
Proper noun
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.
Japanese Meaning
フェルマーの原理：点と点の間を光が進む経路は、進行するのに必要な時間が最小または停留（微小な変化に対して二次的な変化のみ生じる）となる経路であるという、光線状の光学と波動状の光学を結ぶ原理
Sense（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.
