De que é feito optical disc (CD/DVD)
Data is read by a laser.
- Laser diode — utiliza. Read by a laser.
- Reflection of light — utiliza. Reflection from the pits.
- Wave interference — utiliza. The pits cancel the reflected beam by interference — that is how zeros and ones are read.
- Plastic — é feito de. The disc is polycarbonate.
- Alumínio — é feito de. The reflective layer is aluminium.