Spectroscope and internet: what they have in common

1. Step 1. Spectroscope — has part — Diffraction grating. A grating instead of a prism.
2. Step 2. Diffraction grating — works like — Optical disc (CD/DVD). The tracks of a CD split light into a rainbow.
3. Step 3. Optical disc (CD/DVD) — uses — Laser diode. Read by a laser.
4. Step 4. Laser diode — is used in — Optical fibre. The source is a laser.
5. Step 5. Optical fibre — is part of — Internet. The backbones are optical fibre.

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