The consequence of this scattering process is
Consider this sketch of sun and earth:
After volcano eruptions sunrises and sunsets can be very colorful. The reason is that there is a lot of dust in the air.
Why are clouds white? Water droplets are much larger ( about 50 times) than the wavelength of light.
When there are many surfaces to present to reflect light, almost all light is scattered. ==>
Of course: very
dense clouds DO NOT transmit
light.
They either absorb the light or reflect it upward.
a little milk | - | "blue" sky effect |
more milk | - | "white cloud" effect |
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