Among the given colours, Red colour (620 - 780 nm) has thehighest wavelength. The order of colours in light, arranged fromshortest wavelength to longest, is called the visible spectrum of light.Wavelength increases on moving to bottom from top: Violet: 400 - 420 nm. Indigo: 420 - 440 nm. Blue: 440 - 490 nm. Green: 490 - 570 nm. Yellow: 570 - 585 nm. Orange: 585 - 620 nm