This is actually one of the principles of realizing the " invisible cloak" , when the fabric of a garment and the air refractive index are the same, people can be freely " invisible" after wearing it, said the expert.

这位专家说，，这其实是实 “隐形斗篷”的原理之一，当一件衣服的面料与空气折同，人穿上后就可以自由 " 隐形" 。

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，但用简单来说，这意味着蓝光不再以正确的方式弯曲。

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，我们有折为 2.4 的元素，它们在潮湿条件下表更好。

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

这种物质的折很高，意味着光穿过它的速度会大幅降低。

" In addition, refractive index can also be used to 'invisibility', for example, objects with high borosilicate glass materials can also be 'invisible' when moving in glycerol with a refractive index close to its own, " Chu noted.

“此外，折可以用来‘隐形’，比如高硼硅玻璃材料的物体在折接近自身的甘油中运可以‘隐形’，”褚指出。

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，我们有折为 1.9 的元素，它们在干燥条件下表良好。

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，它们是具有不同折的逆反器。

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

在，当光线进入玻璃，因为它的折不同，所以它实际上会弯曲光线。

Some have the regular glass beads on them, and other ones have the 3M elements on them with the 1.9 refractive index or the 2.4 refractive index or a combination of those.

有的上面有普通的玻璃珠，有的上面有折为 1.9 或 2.4 的 3M 元件，或者是它们的组合。

So where the retroreflectors act ideally under dry conditions, as soon as water is on top of them, their refractive index is lowered by a ratio of 1.33.

因此，当反器在干燥条件下理想工作，一旦水覆盖在其上，它们的折就会降低到 1.33 的比例。

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。

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

记住，折与速度有关。

For example, how is it possible for this index to be lower than one, which seems to imply that light would travel faster than the speed of light through some materials.

例如， 折如何可能低于1，这似乎意味着光在某些材料中的传播速度会超过光速。

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，折角由每种介质的折和入角决定。

The angle of refraction inside the glass would be less than theta one, since the index of refraction of glass is greater.

玻璃内部的折角小于theta1，因为玻璃的折更大。

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

即便光线穿过折最高的天然材料，其弯曲程度有限。

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

我还知道空气中的折是 1。

For example, when you shine an x-ray through glass, the index of refraction really is smaller than one.

例如， 当你让X线穿过玻璃，折确实小于1。

And then because many successive shifts to the phase like this are the same thing as light slowing down, this will ultimately explain the index of refraction.

然后因为许多连续的位移就像光减速一样，这最终将解释折。

Remember the index of refraction times sine of the angle of incidence, it is how it comes in, equals the index of refraction on the other side.

记住折乘以入角的正弦，它就是入角，等于另一侧的折。