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notes / phys-101
Light and Colour · Lecture 7
3 sources · 2 chapters
Summary
Sunlight is every colour mixed together. Air scatters the blue part far more than the red, so blue reaches your eye from every direction and the sky looks blue. At sunset the light crosses much more air, the blue is scattered away before it arrives, and what is left is red.
Blue scatters, red gets through
01 · 12:04
Air scatters blue light far more than red . That is why blue comes at you from every direction, even when the sun is behind you.
- Shorter wavelengths scatter more; blue is the shortest we see well
- Violet scatters even more, but our eyes are less sensitive to it
- Clouds look white because their droplets scatter every colour equally
Why sunsets are red
02 · 14:32
At sunset the light crosses far more air, so the blue is scattered away long before it reaches you . The slide shows the longer path through the atmosphere , and the reading gives the same idea its proper name .
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Chapter 2 · Why sunsets are red
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Why does the sky turn red at sunset?
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