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What is the abbreviation of Laser?

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What is the abbreviation of Laser?

(a) Light allowed simple emission of radiation

(b) Light amplification by stimulated emission of radiation

(c) Light amplified simultaneous emission of rays

(d) Light amplified stimulated emanation of rays

This question was posed to me in an interview for job.

Question is from Laser Beam Machining-Introduction topic in chapter Thermal Processes of Advanced Machining

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Right choice is (b) Light amplification by stimulated emission of radiation

Explanation: Full form of laser is Light Amplification by Stimulated emission of radiation.

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