If water had a negative index of refraction, then a straw placed in a glass would appear to bend back under itself.

如果水具有负折射率，那么放在玻璃杯中的吸管似乎可能弯曲到自身下方。

youdao

I'd like to explain the pool water shader. This shader has a tricky refraction but at the end, the result was quite close to my reference.

我必须要跟大家解释下水池的材质。这个材质的折射非常微妙，但后期完全能接近我要的效果。

youdao

Over water the diurnal change in refraction is likely to be small.

在水面上，折光的周日变化可能是很小的。

youdao

Wave refraction: process by which the direction of approach of a wave changes as it moves into shallow water.

UNESCO: L O S S A R Y