<http://schema.org/description>
"I have a thin piece of plastic mounted on the back window of my RV. It magnifies things so I can see better when I&amp;#039;m backing up. How can such a thin piece of plastic magnify things? A regular glass magnifying lens would have to be curved on both sides and much thicker."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/question244.htm>