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Between which two layers, population inversion takes place?

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Between which two layers, population inversion takes place?<br><img src='https://www.fatskills.com/images2/AppliedPhysics2/29.png' data-src='https://i.ibb.co/VthXLxL/29.png' data-width='1024' data-height='1024' alt='29' width='405' height='277' border='0' style='opacity: 1;'>






 
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