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Sensation and Perception
Evaluate These Statements
1.Colour television could produce better quality colour if they used more than three primary colours. (false)
When we are watching television, light rays of different wavelengths enter our eyes. Among the three primary colours of red, green and blue, the mixture of lights occurs in our eyes. It is an additive mixture instead of a subtractive mixture. The three kinds of wavelengths are combined in different proportions to produce almost any colour of lights. So light of other colours is useless to combine more colours.
According to the Trichomatic theory, there are three kinds of receptors, short receptors, medium receptors and long receptors, on our retina which are stimulated by the three primary colours, red, green and blue respectively. The quality of the colour is coded by the pattern of activity of the three receptors rather than by specific receptors for each colour. So the receptors would function in the same way with or without a new primary colour presented.
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