1. Why is the sky blue?

2. Sky Blue The Sun emits equal amounts of all
wavelengths of visible light, and is
therefore WHITE light
Atmospheric nitrogen and oxygen absorb and scatter short wavelengths
Blue light is scattered in all directions, while other wavelengths travel in a straight line to your eye

3. Sun Yellow
Because blue light is scattered, the sunlight that travels directly to your eye is missing blue light
White light – blue light = ??

4. Sunset Red
When the sun is low in the sky, its light travels through more atmosphere
Blue AND some green light is scattered
The remaining wavelengths are orange and red
Dust particles also reflect red light