Lead plates and laser: what they have in common

1. Step 1. Lead plates — is part of — Lead–acid battery. Negative electrodes.
2. Step 2. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
3. Step 3. Submarine — has part — Periscope. A periscope.
4. Step 4. Periscope — has part — Mirror. Mirrors or prisms.
5. Step 5. Mirror — is part of — Laser. A resonator made of mirrors.

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