Optical disc (CD/DVD) and oil lamp: what they have in common

1. Step 1. Optical disc (CD/DVD) — works like — Diffraction grating. The tracks of a CD split light into a rainbow.
2. Step 2. Diffraction grating — is part of — Spectroscope. A grating instead of a prism.
3. Step 3. Spectroscope — has part — Lens. A collimator.
4. Step 4. Lens — is part of — Magic lantern. Lenses.
5. Step 5. Magic lantern — uses — Oil lamp. The light source is an oil lamp.

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