Question

Why do we use red light for signals? what will happen if blue is used?

Answer 1

hey!!

here is ur answer!!

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✔️ We use red light for signals because the wavelength of red light is longest therefore the light of red colour scattered the least by the air Molecules of the atmosphere.

✔️ The light of red colour as compared to other colours like blue can penetrate to a longer distance without becoming weak.

✔️ Hence red light is used for signals so that the signal may be visible from the far distance even in fog, etc..

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hope this helps u!!

Answer 2

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➡A red light is used in traffic signals because it has longest wavelength and it can be seen from a long distance and it can pass through fog also.

➡Blue light Can't penetrate to a longer distance and it will become weak.

➡Therefore, Red light we use for signals instead of Blue light..