Question

Laser radiation is:
A. Highly monochromatic
B. Partially monochromatic
C. White light
D. Divergent light

Answer 1

To answer this question, we need to look into the important properties of laser radiation which is used for its special property of irradiance. Based on the properties, we can eliminate all of the incorrect options, and hence we can get the correct answer.

Complete step by step answer:
The word “Laser” is basically an acronym. The term LASER is abbreviated as a light application by stimulated emission of radiation. The laser radiation is used for its special property of irradiance, that is, when they are sent through larger distances, they show very low divergence. So their power can be focused at a very small spot located at a great distance. Therefore the option D is incorrect.
Unlike other sources of light, laser radiation is coherent in nature. They have two kinds of coherence; spatial coherence and temporal coherence. The spatial coherence is responsible for the non-divergent nature of the laser. And the temporal coherence allows the laser radiation to have light emission which has a very narrow spectrum. So the laser radiation emits a single wavelength light. But we know that white light is a combination of the seven different components of light, i.e., VIBGYOR, which corresponds to seven different wavelengths. So laser radiation is not white light.
Therefore the option C is also incorrect.
From the above paragraph, we can say that laser radiation is highly monochromatic in nature.
Hence, the correct answer is option A.

Note: Due to their ability to be focused on very tiny sots, they are very much used in the processes such as cutting, drilling, welding, cleaning etc. It is also used in the medical industry for eye surgeries, cosmetic surgeries, cancer treatment etc.