we have a liquid product called Rain-X. When you spread it on your windshield, t

Question

we have a liquid product called Rain-X. When you spread it on your windshield, then raindrops beat up. Rain-X seems to add an invisible waxy surface to the windshield. If the only light source is directly in front of you as with normal rural night driving, all of the water droplets vanish almost magically. If you drive under a street lamp when the light comes from the side, then you can see the water droplets, but just for a second until the light passes. I assume that Rain-X works by forcing the raindrops to be tiny hemispherical lenses and I'm not sure about the details. Does it use refraction or total internal reflection, or both?

Explanation / Answer

The first thing it

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