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 Atmospheric refraction

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fearlove
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PostSubject: Atmospheric refraction   Atmospheric refraction Icon_minitimeMon Feb 28, 2011 4:53 pm

Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude. Atmospheric refraction near the ground produces mirages and can make distant objects appear to shimmer or ripple, elevated or lowered, stretched or shortened with no mirage involved. The term also applies to the refraction of sound.
Atmospheric refraction causes astronomical objects to appear higher in the sky than they are in reality. It affects not only lightrays but all electromagnetic radiation, although in varying degrees (see dispersion in optics). For example in visible light, blue is more affected than red. This may cause astronomical objects to be spread out into a spectrum in high-resolution images.


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slavinzing56
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PostSubject: Re: Atmospheric refraction   Atmospheric refraction Icon_minitimeThu Jul 07, 2011 9:47 am

blue is more affected than red
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