When a colour is visible it means
the light wave corresponding to that colour is the only thing that has not been
absorbed by the medium that transmits the light. Whatever colour is reflected,
that shows up; and whatever colours are absorbed, they do not show up.
When
white shows up it means none of the colours is absorbed, all of them are ‘reflected’
and they merge into one colour, white.
When dark shows up it means all the waves of light are absorbed and there is no
‘reflection’.
(Continued...)
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