The visible light spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. It ranges from 400 nanometres (nm) to 700 nm. The different wavelengths of light within this spectrum correspond to different colors.
For example, red light has a wavelength of around 650 nm, while blue light has a wavelength of around 450 nm. When white light hits an object, some of the wavelengths of light are absorbed and the rest are reflected. The reflected light is then detected by the eye and interpreted by the brain as a specific color.
The color of an object is determined by the wavelengths of light that it reflects. For example, a red object reflects red light and absorbs all other wavelengths of light. A blue object reflects blue light and absorbs all other wavelengths of light. And so on.
The visible light spectrum is a continuous spectrum, meaning that there are an infinite number of possible colors between 400 nm and 700 nm. The human eye can distinguish between about 10 million different colors.
