How many colours do white have?

White light is a combination of all the frequencies of light wave that lies in the visible spectrum of electromagnetic spectrum. read more

Before Newton, most scientists believed that white was the fundamental color of light. Ref : Philosophiae Naturalis Principia Mathematica Img : Issac Newton demonstration to white light that could be broken up into its composite colors by passing it through a prism. read more

You have received so many answers that tell you there are seven colours but none tells you why: It was Isaac Newton who divided the colours in seven names. But it has no scientific ground; the electromagnetic force releases by the sun contains unlimited frequencies. read more