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 Justa_TXguy
half-seller of ducks
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Joined: Jan 2004  TX, USA
 
 Posts: 16214 Feedback: 100% (16) |
Posted: 3/16/2012 1:41:16 PM
THE IMAGE ABOVE IS A PAID ADVERTISEMENT I realize that it would be a very, very light shadow if it does cast one, but it still makes me wonder. Would sunlight passing through a void be brighter hitting the ground than sunlight passing through the wind? |
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ColonelHurtz
Horror and moral terror are your friends.
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Joined: Apr 2007  KHM
Posts: 24509 Feedback: 100% (25) Link To This Post |
Posted: 3/16/2012 3:39:34 PM
[Last Edit: 3/16/2012 3:41:33 PM by ColonelHurtz]
Air refracts light.
Depending on it's density, moisture content and contamination, it also absorbs and reflects light to varying degrees. |
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DangerJ
Nut up or shut up
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Joined: May 2007 IA, USA
Posts: 14693 Feedback: 100% (10) Link To This Post |
Posted: 3/16/2012 3:43:31 PM
Ever seen heat distortion? It will cast a shadow more or less.
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JBlitzen
Member
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Joined: Jan 2006 NY, USA
Posts: 18875 Feedback: 100% (12) Link To This Post |
Posted: 3/16/2012 3:45:44 PM
That's why the sky is blue rather than black, OP.
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Captain_Morgan
Question. Challenge. Evolve.
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Joined: Jan 2009 LA, USA
Posts: 1405 Feedback: 0% (0) Link To This Post |
Posted: 3/19/2012 1:08:51 PM
Originally Posted By DangerJ: Ever seen heat distortion? It will cast a shadow more or less. This is a good example. Think of it kinda like the shadows at the bottom of a clear pool of water. Without waves, there's hardly any shadow. When someone splashes around, you can see shadows of the waves.
It's similar with gases. Discontinuities in the gas (different densities or composition, for example) refract light differently, which causes what we see as distortion, or in an extreme case, a shadow. |
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brickeyee
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Joined: Nov 2005 VA, USA
Posts: 9606 Feedback: 0% (0) Link To This Post |
Posted: 3/21/2012 9:47:30 AM
Do a search on Schlieren photography.
It takes some tricks to reliably get good images, but it works very well. |
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Ciraxis
I should be fishing
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Joined: Dec 2008 NY, USA
Posts: 6482 Feedback: 0% (0) Link To This Post |
Posted: 3/27/2012 9:18:48 AM
Originally Posted By brickeyee:
Do a search on Schlieren photography. It takes some tricks to reliably get good images, but it works very well. very cool stuff |
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