What optical disc (CD/DVD) is made of
Data is read by a laser.
- Laser diode — uses. Read by a laser.
- Reflection of light — uses. Reflection from the pits.
- Wave interference — uses. The pits cancel the reflected beam by interference — that is how zeros and ones are read.
- Plastic — is made of. The disc is polycarbonate.
- Aluminium — is made of. The reflective layer is aluminium.