La luce (o spettro visibile) è una porzione di onda elettromagnetica con una frequenza compresa tra i 430 e i 770 TeraHertz [THz], cioè mille miliardi di oscillazioni al secondo. Alle frequenza inferiori corrisponde il rosso (se scendiamo ulteriormente arriviamo infatti all’infra-rosso) a quelle superiori troviamo il viola (andando oltre troviamo l’ultra-violetto). Sappiamo che la…
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