Question

Why are orange or yellow lights are used as fog lights in automobiles.

Answer 1

Yellow light supposedly penetrates further because of its long wavelength, but it's still much smaller than fog particles. The scattering effects of fog are essentially independent of wavelength. Any color would do just as well. ... Red and blue are reserved for emergency vehicles, so yellow is what you get.

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Answer 2

The yellow and red are used because their scattering power is low as compared to other colours and have maximum wavelength