The reason why the sky is blue is Rayleigh Scattering. Shorter wavelengths are scattered more strongly than longer wavelengths. But then, why shouldn't the sky be purple or violet?
3 years, 9 months ago
The sky appears violet or pinkish purple at twilight, especially during the one between dusk and sunset, when the sky is not obscured by dust and clouds. Of course, violet is scattered more strongly and the reason we don't usually see it because our eyes are more sensitive to blue than violet!
Log in to reply