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[Stockbild] Optical microscope, coloured X-ray. The viewing lens (eyepiece, top right), focusing wheel (upper right) and objective lenses (centre) are seen. At lower centre is the specimen table (stage), and below this is an electrical light source, which directs light up through the specimen. The clips on the stage hold the specimen in place, while the objective lenses are mounted on a swivel mechanism that allows the magnification to be changed. (KEYSTONE/SCIENCE PHOTO LIBRARY/GUSTO) === ===