Spectroscope and glasses: what they have in common

1. Step 1. Spectroscope — has part — Prism. A prism.
2. Step 2. Prism — is part of — Binoculars. Porro prisms flip the image.
3. Step 3. Binoculars — evolved from — Telescope. A double telescope.
4. Step 4. Telescope — evolved from — Glasses. The first telescopes were assembled by spectacle makers.

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