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Ford — C-Max Solar Energi Concept Car

The key to the Solar Energi is a concentrator Fresnel lens that sits above the vehicle when it's parked. It's essentially a giant magnifying glass that amplifies the sun's rays. Fresnel lenses were originally developed for lighthouses.

C-Max Solar Energi's tires are designed to move — on their own — in tandem with the sun's movements across the sky, ensuring that it gets the most direct sunlight possible.