Chuck Nice
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So the combination of getting through the molecule plus the speed of light between molecules, on average...
slows down the propagation of light through the medium.
This is called the index of refraction.
And it's a beautiful mathematical construct.
The index of refraction.
Ooh, I love it.
And I'll tell you how it works.
The index of refraction, you can use that in a formula to tell you how much the light will bend coming in or out of that medium.
That's how you make a lens at all.
The index of refraction, if you take the speed of light
And divide by the index of refraction.