Digital cameras could be shrunk to half their size if their image sensors were curved, say scientists at Princeton University in New Jersey. By slashing the number of image-correcting lenses needed, the curvy sensors would also make cameras lighter. Digital cameras produce images by focusing light onto a flat grid made up of hundreds of thousands of tiny light-sensitive components. Photons striking this charge-coupled device (CCD) produce an electrical charge proportional to the energy, and so brightness, of the incoming photons.
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