Page 13 - HAIR COLOUR

Another experiment by Young-Helmholtz the theory of colour vision
confirms how we use the Retina cone and rod cells. Imagine being in a
darkened room after a few seconds our eyes adjust using our Retina rod
cells we start to see dark shapes. Suddenly three light beams shine on the
far wall one red one green and one blue. As they overlap three secondary
colours form yellow, magenta and cyan and where all six colours overlap
the three different types of Retina cone cells all become excited at the
same time, and the colour white is recognised through the human eye.
(Fig 10.)

Fig10.

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