Diffraction grating and electronic calculator: what they have in common

1. Step 1. Diffraction grating — uses — Wave interference. Interference.
2. Step 2. Wave interference — is used in — Security hologram. The image is recorded by interference.
3. Step 3. Security hologram — is part of — Payment card. A hologram.
4. Step 4. Payment card — has part — Integrated circuit. An EMV chip.
5. Step 5. Integrated circuit — is part of — Electronic calculator. A chip.

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