10 Digital audio
Part 2
Compact discs
The vital component in a CD player is the laser, and without this it would be impossible either to make CDs or play from them. So what is a laser? It is, of course, a light source, but the light it emits is particularly pure in that it consists of one wavelength only. Ordinary light, as is well known, is made up of a wide range of wavelengths and this causes difficulties when the light is focused with a lens. The various wavelengths are treated slightly differently and this can be seen in the colour effects when one looks through an ordinary magnifying glass. The effect is particularly noticeable near the edges of the lens. Lenses for high-quality cameras are designed to reduce this chromatic aberration, ...
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