The principle of LASER action involves:

Amplification of particular frequency emitted by the system

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Population inversion

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Stimulated emission

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All of the above

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Solution

The correct option is C All of the above
LASER stands for "Light amplification by stimulated emission of radiation".
Laser action involves all the given phenomena:
1. Amplification of particular frequency
2. Population inversion
3. Stimulated emission

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