Optical discs. Compact discs (CDs) and digital versatile discs (DVDs) are examples of optical discs. An optical disc digitally stores music and other data as tiny depressions in a plastic disc. This disc is coated with a fine film of metal and then by another layer of plastic. The depressions form a spiral track moving from the centre of the disc to the outer edge. The data track is about 0.5 micrometres wide,and would stretch out for nearly 5 kilometres if unravelled. The information is read by a laser light that reflects from the metal layer,allowing the original data to be reconstructed | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / DANIEL SAMBRAUS, THOMAS LUDDINGTON |
Bildgröße: | 4500 px × 3000 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |