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Why are ‘danger’ signal lights red in colour?

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asked Mar 15, 2018 in Physics by Anuja (1,123 points) ● 1 ● 3 ● 8
Why are ‘danger’ signal lights red in colour?

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answered Mar 15, 2018 by Annu Priya (18,055 points) ● 24 ● 45 ● 85
selected Mar 15, 2018 by Anuja
 
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Danger signal lights are red in color because the red colored light having longer wavelength is scattered the least by fog or smoke. Therefore, it can be seen clearly from a distance.

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