This substance has a high refractive index, meaning the speed of light passing through it is greatly reduced.

这种物质的折射率很高，意味着穿过它的速度会大幅降低。

To combat this rain visibility problem, 3M actually developed these elements, which are retroreflectors that have different refractive indices.

为了解决雨天能见度的问题，3M 公司实际上开发了这些元件，它们是具有不同折射率的逆反射。

And on this side, we have elements that have a 2.4 refractive index and work better in wet conditions.

而在另一侧，我们有折射率为 2.4 的元素，它们在潮湿条件下表现更好。

Now, when light enters glass, it's a different refractive index, so it actually bends the light.

现在，当线进入玻璃时，因为它的折射率不同，所以它实际上会线。

That is a special crystal that has two different indices of refraction.

这是一种特殊晶体，具有两种不同的折射率。

And so index of refraction, remember is related to the velocity.

记住，折射率与速度有关。

Technically, this changes the index of refraction, but in plain English that means blue light is no longer bent the right way.

从技术上讲，这会改变折射率，但用简单来说，这意味着蓝不再以正确的方式。

Even when passing through natural materials with the highest refractive indexes, light can only bend so far.

即便线穿过折射率最高的天然材料，其程度也有限。

Like polarization, how scattering works and how an index of refraction works.

像偏振一样，散射是如何工作的以及折射率是如何工作的。

And so the index of refraction goes up as the velocity decreases.

因此，折射率会随着速度的降低而上升。

So on this side, we have elements that have a refractive index of 1.9, and they work well in dry conditions.

在这一侧，我们有折射率为 1.9 的元素，它们在干燥条件下表现良好。

I also know in air the index of refraction is 1.

我还知道空气中的折射率是 1。

In other words, the higher the index of refraction, the smaller the angle.

换句话说，折射率越高， 角度越来越小。

And when a ray enters a medium with an increased index of refraction, the angle of refraction decreases.

当具有高折射率的介质线通过时，折射角减小。

I am also given the index of refraction of the surface down here, the glass is 1.5.

我还给出了这里表面的折射率，玻璃是 1.5。

And so could you figure out the index of refraction?

那么您能算出折射率吗？

This right here is the first key idea with the index of refraction.

这个就是关于折射率的第一个关键概念。

Snell’s Law says that angles of refraction are determined by the index of refraction for each medium and the angle of incidence.

斯涅尔定律指出，折射角由每种介质的折射率和入射角决定。

Because the index or the refraction is equal to the speed of light divided by the velocity.

因为折射率等于速除以速度。

Snell's Law says that angles of refraction are determined by the index of refraction for each medium and the angle of incidence.

折射定律说折射角由每种介质的折射率和入射角决定。