: an isomer that is a stereoisomer of a compound having two or more chiral centers and that is not a mirror image of another stereoisomer of the same compound â
A compact disc is a deceptively simple looking device considering the technology required to make it. 1  CDs consist of three layers of materials: 2  A base layer made of a polycarbonate plastic. 3  A thin layer of aluminum coating over the polycarbonate plastic. 4  A clear protective acrylic coating over the aluminum layer.
Compact disc - Physical details. 1  A polycarbonate disc layer has the data encoded by using bumps. 2  A shiny layer reflects the laser. 3  A layer of lacquer protects the shiny layer. 4  Artwork is screen printed on the top of the disc. 5  A laser beam reads the CD and is reflected back to a sensor, which converts it into electronic data.