Tire placard pressure is often much lower than listed on the tire sidewall. Air pressure given by the vehicle maker was based on the tires supplied with the vehicle. They design many newer replacement tires to give a good ride, with much more pressure.
Fresnel lens. A Fresnel lens is a type of lens invented by Augustin-Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large size and short focal length without the weight and volume of material which would be required in a lens of conventional design. Detailed information.
Related Web Sites. 1  Lighthouses and the Fresnel Lens-This Web site gives a brief description of the Fresnel lens, along with additional Web links where you can find more information about the Fresnel lens.his light could be seen for more than 20 miles. Fresnelâs design of concentric glass rings to concentrate light is still used today in the production of automobile headlights, traffic signals and projectors.