Orange is a perceived color resulting from the combination of specific wavelengths of visible light, generally falling within the range of longer wavelengths that include red and shorter wavelengths that include yellow. Physically, its appearance is determined by the light spectrum reaching the observer and how that light is reflected or emitted by a material. In the context of optics, the perceived hue is not a substance itself but rather a visual sensation created when the intensities of the red and yellow components of light are balanced and combined. This combination is fundamentally described by the additive mixing of electromagnetic radiation within the visible spectrum.