<page_title> Blue </page_title> <section_title> Optics </section_title> <table> <cell> blue <col_header> sRGB rendering of the spectrum of visible light </col_header> <col_header> Colour </col_header> </cell> <cell> 450–495 nm <col_header> sRGB rendering of the spectrum of visible light </col_header> </cell> </table>
Blue has a wavelength of 450 to 495 nanometres.