Reflecting telescope and payment card: what they have in common

1. Step 1. Reflecting telescope — has part — Mirror. The primary mirror.
2. Step 2. Mirror — is part of — Interferometer. Mirrors.
3. Step 3. Interferometer — uses — Wave interference. Interference.
4. Step 4. Wave interference — is used in — Security hologram. The image is recorded by interference.
5. Step 5. Security hologram — is part of — Payment card. A hologram.

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