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Description
Primary colours are sets of colours that can be combined to make a useful range (gamut) of colours. For human applications, three are often used; for additive combination of colours, as in overlapping projected lights or in CRT displays, the primary colours normally used are red, green, and blue.
Primary colours are not a fundamental property of light but are often related to the physiological response of the eye to light. Fundamentally, light is a continuous spectrum of the wavelengths that can be detected by the human eye, an infinite-dimensional stimulus space. However, the human eye normally contains only three types of colour receptors called cone cells. Each colour receptor responds to different ranges of the colour spectrum. Humans and other species with three such types of colour receptors are known as trichromats. These species respond to the light stimulus via a three-dimensional sensation, which can generally be modelled as a mixture of three primary colours.

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Model

Eyes [link] by [link]
[link] by [link]

Sky - Photo taken by me

Thanks

Description
Primary colours are sets of colours that can be combined to make a useful range (gamut) of colours. For human applications, three are often used; for additive combination of colours, as in overlapping projected lights or in CRT displays, the primary colours normally used are red, green, and blue.
Primary colours are not a fundamental property of light but are often related to the physiological response of the eye to light. Fundamentally, light is a continuous spectrum of the wavelengths that can be detected by the human eye, an infinite-dimensional stimulus space. However, the human eye normally contains only three types of colour receptors called cone cells. Each colour receptor responds to different ranges of the colour spectrum. Humans and other species with three such types of colour receptors are known as trichromats. These species respond to the light stimulus via a three-dimensional sensation, which can generally be modelled as a mixture of three primary colours.

Source [link]

Model

Eyes [link] by [link]
[link] by [link]

Sky - Photo taken by me

Thanks