Cars use a convex mirror or the right side. It bends outward like the a dome. The image will always be right side up and smaller than the actual object but it allows you to see a wider area than a flat mirror. On the other end are concave mirrors. This is the mirror used at a carnival. The image can be right side up or upside down; larger or smaller than the actual object depending how far you are standing from the mirror.
Eye glasses work on the same principal. Nearsighted people use concave lenses (thicker at the edges than in the middle) Farsighted people use convex lenses (thinner at the edges than in the middle)
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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