Last Updated：2025/12/07
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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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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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。
