What is the wavelength range of infrared light?

The wavelength range of infrared light is correctly identified as spanning from -700nm to 30,000nm. This range encompasses the part of the electromagnetic spectrum that falls just beyond the visible light spectrum, starting where red light concludes. Infrared light is commonly categorized into three regions: near-infrared (approximately 700nm to 1400nm), mid-infrared (1400nm to 30000nm), and far-infrared (beyond 30000nm).

Understanding this range is essential, especially in contexts such as tanning, where infrared light can have specific effects on the skin and is utilized in various types of light therapy. Recognizing the true wavelength boundaries of infrared light helps in applications across disciplines, including phototherapy, infrared heating, and even in the understanding of natural sunlight. The other options don't accurately represent the wavelength range associated with infrared light, reinforcing why the specified range is the correct choice.