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Fiber Optics MCQs

The population inversion phenomenon in optical sources occurs when _________.

the population of atoms in the upper energy level is greater than in the lower energy level

the population of atoms in the lower energy level is greater than in the upper energy level

the population of atoms in the upper and lower energy levels is equal

None of the above

Answer

Correct Answer: the population of atoms in the upper energy level is greater than in the lower energy level

Explanation:

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