Last Updated：2025/12/07
Sentence
フェルマーの原理は、境界で光線が屈折する理由を説明します。すなわち、光が二点間を実際に進む経路は、経路のわずかな変化に対して移動時間が定常（単純な場合には最小）になる経路であると述べています。
Quizzes for review
Fermat's principle explains why light rays bend at an interface: it states that the path actually taken between two points is the one that makes the travel time stationary (and in simple cases, minimal) with respect to small variations of the path.
See correct answer
Fermat's principle explains why light rays bend at an interface: it states that the path actually taken between two points is the one that makes the travel time stationary (and in simple cases, minimal) with respect to small variations of the path.
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Related words
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
English - English
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