Answer:
Angstroms and Nanometers
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Angstroms: "a unit of length equal to one hundred-millionth of a centimeter, 10−10 meter, used mainly to express wavelengths and interatomic distances."
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Nanometers: "Wavelengths of visible light are measured in nanometers (nm). A nanometer is a unit of length equal to one billionth of a meter."
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