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[Duncan Moore] As an example of a gradient index material I have here a piece a plastic. And you notice as I shine a laser beam straight through it, it goes straight through as you would expect. But as I move the laser beam up, it curves down and so what weve got is weve got a change in the composition from the top to the bottom. So everybodys observed this phenomenon. When the light goes down here at an angle notice it comes out about the same angle going uphill. This is exactly what happens when the road appears to be wet on a hot summers day. The road is black, its absorbing the heat, its heating up the air its changing the density of the air as a function distance above the road surface and whats happening is light that should have gone in a straight line, which would have gone right straight into the road bends around and it comes back up to your eye. So as the observer on my left and on your right, you think that the light has come from below the roads surface. So what