Refraction is the name of that change of direction. When light (and sometimes sound, or a radio wave) moves from one material into another — air to water, air to glass — it changes speed, and so it changes path. That event is refraction.

Refraction is the name ofRefraction指的就是這個名字， that change of direction也就是那種方向上的改變。 When light (and sometimes sound, or a radio wave) moves from one material into another當光（有時候是聲音，或無線電波）從一種介質進入另一種介質 — air to water, air to glass —──像是從空氣到水，或從空氣到玻璃── it changes speed它的速度會改變， and so it changes path所以路徑也跟著改變。 That event is refraction這個現象就是refraction（折射）。

Physics, glasses, and photography need the noun because they talk about the amount of bend, not only the verb “it bends.” Though actually, the line you often see, “glass refracts light,” is the action; refraction is the happening, or the result.

Physics, glasses, and photography need the noun物理、眼鏡、攝影都需要這個名詞， because they talk about the amount of bend因為他們要講的是彎折的程度， not only the verb “it bends.”而不只是動詞「it bends（它會彎）」。 Though actually, the line you often see, “glass refracts light,” is the action不過其實，你常看到的「glass refracts light（玻璃使光線折射）」講的是動作， refraction is the happening, or the resultrefraction則是這個發生的過程、或結果。

A pool can look shallower than it is because of refraction, and a lens works because of it. Keep it apart from reflection, which is bouncing back from a surface.

A pool can look shallower than it is because of refraction因為refraction，一座游泳池可能看起來比實際的還要淺， and a lens works because of it而鏡片也是靠它才能發揮作用。 Keep it apart from reflection要把它跟reflection（反射）分開來， which is bouncing back from a surfacereflection指的是從表面彈回來。