Amplifier and glasses: what they have in common

1. Step 1. Amplifier — is part of — pH meter. It amplifies the weak signal of the electrode.
2. Step 2. pH meter — has part — Liquid-crystal display. An indicator.
3. Step 3. Liquid-crystal display — has part — Polarizing filter. Polarizers.
4. Step 4. Polarizing filter — is part of — Sunglasses. Polarized glasses.
5. Step 5. Sunglasses — evolved from — Glasses. Glasses with dark lenses.

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