700nm400nm

700nm400nm refers to a range of electromagnetic radiation, specifically light, spanning from 400 nanometers to 700 nanometers in wavelength. This region is commonly known as the visible light spectrum. Within this range, different wavelengths correspond to different colors perceived by the human eye. Violet light has the shortest wavelength at approximately 400 nm, gradually transitioning through blue, green, yellow, orange, and finally to red light, which has the longest wavelength at around 700 nm. The interaction of light within this spectrum with matter determines how objects appear to us. For instance, an object that absorbs all wavelengths except green will appear green to an observer. The 700nm400nm range is fundamental to vision, photography, and many scientific and technological applications, including spectroscopy and optical communication. It represents the portion of the electromagnetic spectrum that is detectable by the photoreceptor cells (rods and cones) in the human retina.