A compact disc under skimming light rays.
De Luca R., Di Mauro M., Fiore O., Naddeo A.
VII - Didattica e storia della fisica
Aula 29C-3 - Venerdì 21 h 15:30 - 18:30
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The optical properties of a compact disc (CD) under skimming light rays have been analyzed. We have noticed that a clear green line can be detected when the disc is irradiated with light rays coming from a lamp in such a way that only those skimming the CD, held horizontally, are selected. We provide a physical interpretation of this phenomenon on the basis of elementary optics concepts. An extension of these concepts to digital versatile discs (DVDs) is given.