What are primary and secondary colours of light?
White light consists of seven distinct colours- red, orange, yellow, green, blue, indigo, and violet
. Of these seven colours, the human eye has receptors for only three- red, green, and blue. These three are called the 'primary colours' of light.
The brain interprets other colours by combinations of these three colours to form secondary colours. The primary colours must be combined in the correct amounts so as to form the secondaries.
Additional colours are formed by varying the quantities. For example, purple may be formed by using considerably more blue light than red. Conversely, using more red than blue will form pink.
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