What are the primary colours? Name the three primary colours.

Hint colours are the important aspect of life that differentiate the life of a human from other living things. Not all the living things can recognize colours as much as humans do.

Complete step by step answer
When a light enters the eye, first it strikes the cornea, the cornea bends or refracts the light into the retina of the eye, the light that passes through it to the retina which converts light into neural signals and sends it to the brain for visual recognition.
Every object has colour. When light hits on an object some of the light waves bounce off the object and some are absorbed by it. Only colours that are bounced off or reflected can be seen by our eyes
Let us take a mango, the colour of a mango is yellow. The wavelength of yellow colour is about 570 to 580 nanometres. The mango looks yellow in colour because light waves of 570 to 580 nanometres bounce off from a mango
The colours are classified into primary, secondary and tertiary colours.
We know that some colours can be made by mixing other colours.
Primary colours
Primary colour is the colour that is unique and cannot be created by mixing other colours. There are three primary colours namely red, yellow and blue
Secondary colour is the colour that can be created by mixing primary colours. There are three secondary colours namely violet, orange and green
Tertiary colours can be created by mixing the primary and secondary colours. Mainly there are eighteen tertiary colours

Note The sun’s rays contain all the colours of the rainbow. It is mixed up and looks like white colour. We can understand that from Newton's ring we think black a colour, but scientists do not consider black as a colour because black is not a colour it is absence of all colour.