Last Updated：2025/11/21

(physics) The ratio of the speed of light in air or vacuum to that in another medium.

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refractive index

Source Word

refractive index

(physics) The ratio of the speed of light in air or vacuum to that in another medium.

Japanese Meaning

屈折率―空気または真空中の光速度と、他の媒質中の光速度との比率

The refractive index of diamond causes light to bend sharply and sparkle.

ダイヤモンドでは、光が真空中で進む速さとダイヤモンド中で進む速さの比率によって、光が大きく屈折してきらめきます。

Sense（1）

(physics) The ratio of the speed of light in air or vacuum to that in another medium.

refractive indices

（ plural ）