Laser stands for:

Explanation

LASER is the acronym for Light Amplification by Stimulated Emission of Radiation. NASA Space Place explains that a laser produces a very narrow beam of light, unlike ordinary sources such as a bulb or flashlight. Its light waves have very similar wavelengths and travel together in phase, which makes the beam narrow, bright and capable of being focused into a tiny spot. That meaning fits the key words in the acronym: light is amplified through stimulated emission to produce radiation in the form of a focused beam. Theodore Maiman built the first laser in 1960, and the technology is now used in surgery, communications including fibre optics, manufacturing, military systems, barcode scanners and scientific research.

Why the other options are wrong

• (A) This option invents a solar-energy phrase, while the verified expansion is about light amplification through stimulated emission, not longitudinal absorption of solar radiation.
• (B) A laser does not stand for light acceleration or energy release; the acronym uses amplification, stimulated emission and radiation.
• (D) This option changes the core process from amplification to absorption and uses simulated emission of rays, whereas the accepted term is stimulated emission of radiation.

Concept

This tests a basic Science and Technology acronym, a common RAS area because such terms link definitions with everyday applications. LASER recurs because it connects core physics with uses in medicine, communication, manufacturing, defence and research.

Source

• NASA Space Place

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