According to this link https://www.the-scientist.com/?articles.view/articleNo/48584/title/Newton-s-Color-Theory--ca--1665/, Newton's rainbow forms the familiar ROYGBIV because he thought the range of visible colors should be analogous to the seven-note musical scale.

Can we reduce the sunlight to three main light as blue (or violet) light, green light and red light ? (The others are overlaid of this lights due to irregular light diffraction according to Young-Helmholtz Theory.)

 

 

14 minutes ago, Hasan Özel said:

Can we reduce the sunlight to three main light as blue (or violet) light, green light and red light ?

 

No.

Edited April 7, 20187 yr by studiot

1 hour ago, studiot said:

 

 

No.

What is the reason for your answer is no,can you explain Mr.Studiot ? 

The decision to break light up into seven colors was artificial. Three would also be artificial, and since the light is a continuum of wavelengths, it would arguably be a worse representation.

It is important to distinguish "pure" colors of the spectrum from what the eye sees.  For example red light plus green light will look yellow or orange, but a spectral analysis could tell the difference.

2 hours ago, Hasan Özel said:

What is the reason for your answer is no,can you explain Mr.Studiot ? 

How would you obtain violet light using only red, green and blue light?

 

Note you can obtain the subtractive colour violet by shining white light onto a violet coloured object, thereby removing all but the violet light from the white.

Edited April 7, 20187 yr by studiot

15 minutes ago, studiot said:

How would you obtain violet light using only red, green and blue light?

 

Note you can obtain the subtractive colour violet by shining white light onto a violet coloured object, thereby removing all but the violet light from the white.

The computer screens create perfectly using this RGB lights.(i.e LG G5 smartphone can display 16M colors)

Colors can not be obtained by combining monochromatic lights like red,green and blue are the main components of the daylight.

I think the most logical explain is Mr. Swansont's answer :

"The decision to break light up into seven colors was artificial. Three would also be artificial, and since the light is a continum of wavelengths, it would arguably be a worse representation."

58 minutes ago, mathematic said:

It is important to distinguish "pure" colors of the spectrum from what the eye sees.  For example red light plus green light will look yellow or orange, but a spectral analysis could tell the difference.

This is more about the wavelength, if we divide the visible spectrum to infinite range,we will obtained infinite "pure" colored light. In this context, "7" is just an artificial number for dividing visible light spectrum. 

One needs to draw the distinction between actual color and perceived color. When discussing physics, we want to know the actual color, i.e. the wavelegth.