Question

why red colour light is used for signal purpose in railway​

Answer 1

Answer:

Because of longer wavelength.. Red light scatter less with comparison to other colours. That's why Red color is used for signal purpose in railway ....

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Answer 2

It is used as human eyes are more attentive to the colours which have more darkness and backing in the Rainbow colour 'VIBGYOR'

As Red comes at last it is used for signal purposes....

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