The Young-Helmholtz trichromatic theory of colour vision is based on the laws of additive colour mixture and argues that each of the three types of cones is most sensitive to one wavelength of light.

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The Young-Helmholtz trichromatic theory of color vision posits that the human eye has three types of receptors (cones) sensitive to three specific wavelengths of light, corresponding to red, green, and blue. This theory explains how different colors are perceived through the additive mixing of these primary colors.

The Young-Helmholtz Trichromatic Theory of Colour Vision Is Based on the Laws