Red light signal is used as a danger signal because
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red light signal is used as danger signal because red colour is very high light and its power is very high so our eye attract.
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Red light is least scattered,red have the longest wavelength A biologist's answer is that nature uses red as a warning color because it stands out most vividly against a green background. Other answers are that we associate it with danger because it is the color of fire and blood.
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