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What is colour? Why do some objects look red, others green, others blue? Colour is caused by reflected(反射的) light rays. We see colour because objects reflect light. Something that is red reflects mostly red light. It reflects a little green or blue light, too, but we do not see it. In the same way, a green object reflects mostly green light. White objects reflect all colours of light. Black objects do not reflect any light. What happens to the colours of light that are not reflected? They are absorbed(吸收) by the object. The darker the colour, the less light is reflected and the more light is absorbed. Light that is absorbed is turned into heat. For this reason, dark-coloured clothes are warmer in the sunlight than light-coloured clothes.
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