Lens and steam turbine: what they have in common

1. Step 1. Lens — is part of — Sextant. The sextant’s telescope.
2. Step 2. Sextant — has part — Mirror. Mirrors — the principle of double reflection.
3. Step 3. Mirror — is part of — Solar concentrator. Mirrors concentrate the light.
4. Step 4. Solar concentrator — has part — Steam turbine. Heated steam turns a turbine.

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