What does "monochromatic" mean in relation to lasers?

• A. Multiple colors of light
• B. A combination of various wavelengths
• C. Single wavelength color
• D. Variable intensity of color

Answer: (C)

In the context of lasers, "monochromatic" refers to the emission of light at a single wavelength or color. This characteristic is fundamental to lasers, as they produce coherent light that is highly focused and consists predominantly of one specific wavelength, making them distinct from other light sources, like incandescent bulbs, that emit light across a broad spectrum of wavelengths.

Monochromatic light ensures that all the photons emitted have the same energy and, therefore, the same color, which is crucial for many applications, such as in telecommunications, laser cutting, and medical procedures. By contrast, other options refer to multiple colors, various wavelengths, or variable intensities, which do not align with the essential definition of monochromatic light. In essence, the presence of a single wavelength is what defines the term in relation to lasers.