Operating microscope and atomic clock: what they have in common

1. Step 1. Operating microscope — has part — Lens. Lenses provide the magnification.
2. Step 2. Lens — is part of — Spectroscope. A collimator.
3. Step 3. Spectroscope — is used in — Spectral lines. They are observed with a spectroscope.
4. Step 4. Spectral lines — is used in — Atomic clock. The second is defined by the frequency of an atomic transition.

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