Visible spectra refer to the range of electromagnetic radiation wavelengths that are visible to the human eye. Some synonyms for visible spectra include the visible light spectrum, the optical spectrum, and the color spectrum. The visible light spectrum is further divided into different colors such as red, orange, yellow, green, blue, indigo, and violet. Each color corresponds to a specific wavelength of light, with red having the longest wavelength and violet having the shortest. The optical spectrum is used to describe the entire range of electromagnetic radiation that can be seen, including infrared and ultraviolet radiation. Finally, the color spectrum is often used to describe the different colors visible in the visible light spectrum.