Which color has the longest wavelength within the visible spectrum of light?

In the context of the visible spectrum of light, red light possesses the longest wavelength. Light is part of the electromagnetic spectrum, and its wavelengths range across various colors. The visible spectrum ranges from violet at around 380 nanometers to red at about 700 nanometers.

Red light, with its longer wavelength, is at the end of this spectrum, making it the color with the longest wavelength visible to the human eye. This property is intrinsic to the way light is refracted and perceived by our eyes, influencing various phenomena such as the colors we see in a rainbow. Understanding this is essential for estheticians, as light's properties can affect treatments that utilize light therapy and other techniques in skin care.