Wave interference and solar panel: what they have in common

1. Step 1. Wave interference — is used in — Security hologram. The image is recorded by interference.
2. Step 2. Security hologram — is part of — Payment card. A hologram.
3. Step 3. Payment card — has part — Integrated circuit. An EMV chip.
4. Step 4. Integrated circuit — is part of — Electronic calculator. A chip.
5. Step 5. Electronic calculator — has part — Solar panel. Many run on a solar cell.

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