Small mirror and glasses: what they have in common

1. Step 1. Small mirror — is part of — Torsion balance. It reflects the beam for reading the angle.
2. Step 2. Torsion balance — is made of — Silver. The suspension fibre is a thin silver wire.
3. Step 3. Silver — is material for — Dental filling. Silver in the amalgam.
4. Step 4. Dental filling — uses — Ultraviolet. Light curing.
5. Step 5. Ultraviolet — is used in — Sunglasses. A UV filter.
6. Step 6. Sunglasses — evolved from — Glasses. Glasses with dark lenses.

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