explain why in white light red paint appear red
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Answer:
A red jumper is red when viewed in white light because all the wavelengths of the spectrum that fall on it are absorbed except red which is reflected into the eye. In practice, it is probably more accurate to say that the red jumper reflects more red light than other colours and so appears red. There are few pigments that are completely pure and only reflect one colour but some reflect mostly one colour.
A black coat appears black because it absorbs all the wavelengths of visual light that fall on it and no light is reflected into the eye from that object. It is because of this that black clothes become hotter on a sunny day that white ones.
It is interesting to consider what colour a blue dress will appear if viewed in a red light source! (Answer - black) Hence it is a good idea to choose clothes or carpet near a window or in daylight as they can appear rather different in shop lights. Paints are the result of colour by subtraction too. Red paint only reflects the red part of the spectrum, the rest is absorbed. Hence when many coloured paints are mixed together, the result tends to be murky and blackish! The different paints mixed together absorb just about all the light falling on them.
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