Retroreflector e railway semaphore: o que têm em comum

1. Passo 1. Retroreflector — utiliza — Reflection of light. A corner-cube prism.
2. Passo 2. Reflection of light — é utilizado em — Otoscope. A small mirror directs the light.
3. Passo 3. Otoscope — tem como parte — LED. Illumination.
4. Passo 4. LED — faz parte de — Traffic light. LEDs.
5. Passo 5. Traffic light — evoluiu de — Railway semaphore. The first traffic light was a railway-style semaphore.

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