Question:
Which one of the following is NOT a property of a LASER?
Which one of the following is NOT a property of a LASER?
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LASER = Stimulated. Ordinary Light = Spontaneous.
Updated On: May 13, 2026
- It is monochromatic.
- It is coherent.
- It is directional.
- It exhibits spontaneous emission.
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The Correct Option is D
Solution and Explanation
Step 1: Concept
LASER stands for Light Amplification by Stimulated Emission of Radiation.
Step 2: Meaning
The fundamental principle of a laser is stimulated emission, where an incoming photon triggers an excited atom to drop to a lower energy state, releasing a second identical photon.
Step 3: Analysis
Properties like monochromaticity (single wavelength), coherence (waves in phase), and directionality are hallmarks of laser light. Spontaneous emission is the random release of light seen in ordinary sources like light bulbs.
Step 4: Conclusion
Therefore, spontaneous emission is the process lasers aim to overcome through stimulated emission to maintain their unique properties. Final Answer: (D)
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