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The three primary colours of light are red, green and?
A. Yellow
B. Blue
C. White
D. Orange
Correct Answer Is Option = Blue
Notes / Explanation
The three primary colours of light are red, green and blue, and from these three colours of light, when combined in various ways, all the other colours of light can be produced. In the study of light and colour, it is found that light can be of different colours, and that white light, such as ordinary daylight, is in fact made up of a mixture of colours, which can be separated, for example when white light passes through a prism or forms a rainbow, showing the range of colours. It is also found that colours can be produced by combining lights of different colours, and that there is a small set of colours of light, called the primary colours of light, from which all the other colours can be made by combining them in various proportions. The three primary colours of light are red, green and blue. By combining these three colours of light in various proportions, a great range of other colours can be produced; for example, combining red and green light produces yellow light, and combining all three of the primary colours together in the right proportions produces white light. This is the basis of the way in which colour is produced in television and computer screens and similar displays, which create all the colours of the picture by combining tiny points of red, green and blue light in various proportions. It is important to note that the primary colours of light, which are combined by adding lights together, are different from the primary colours used in mixing paints and pigments, which work in a different way, because mixing paints involves the taking away of colours from light rather than the adding of lights together, so that the primary colours in the mixing of paints are a different set. The study of light and colour, including the primary colours of light, is a part of the science of physics. For PPSC and other competitive examinations, the key points to remember are that the three primary colours of light are red, green and blue, that by combining these three colours of light in various proportions all the other colours of light can be produced, that combining all three together in the right proportions produces white light, and that this is the basis of the way colour is produced in television and computer screens, while the primary colours of light are different from the primary colours used in mixing paints, which work in a different way.
