Mon Prof Augmenté
Blue Sky Light
Age 12 · Physics
Sunlight contains many colors. Air makes short blue waves spread out much more than long red waves, so the sky looks blue.
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In the picture
- Incoming sunlight: white light entering the clear air.
- Tiny gas sphere: a small particle floating in the air.
- Blue light path: a short wave bending away in many directions.
- Red light path: a long wave passing mostly straight through the air.
Examples
- A clear sky at midday looks blue.
- The Sun looks redder near sunset.
Key takeaways
- Short blue light waves are spread widely by air.
- Long red light waves are spread less and travel straighter.
Quiz: Blue Sky Light (Age 12)
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What does air do to short blue light waves?
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How do long red light waves behave in air?
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Why does the sky look blue?
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