Diffraction grating and solar panel: what they have in common

1. Step 1. Diffraction grating — is part of — Spectroscope. A grating instead of a prism.
2. Step 2. Spectroscope — has part — Prism. A prism.
3. Step 3. Prism — is part of — Binoculars. Porro prisms flip the image.
4. Step 4. Binoculars — evolved from — Telescope. A double telescope.
5. Step 5. Telescope — includes — Space telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.
6. Step 6. Space telescope — has part — Solar panel. Solar panels.

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