Visible spectrum

White light is called as white because it consists of seven colors. The sunlight splits into seven colors namely violet, indigo, blue, green, orange, and red . We usually call it as VIBGYOR. When we mix all these colors we just get one light which is the WHITE light.

The division used by Isaac Newton, in his color wheel, was: red, orange, yellow, green, blue, indigo, and violet ; a mnemonic for this order is “Roy G. Biv”.

The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays .