Color of the sky
Part of the electromagnetic Rayonnement emitted by the Sun is reflected by the terrestrial atmosphere, including visible Rayonnement S (Lumière). Another part penetrates this atmosphere, and possibly the cross-piece, more or less directly, until reaching the eye of an observer. The terrestrial atmosphere diffuses the radiations coming from the sun, more especially as them Wavelength is short (what corresponds, in the Visible spectrum, with the Couleur S close relations of the Violet).
When we direct our glance towards the sun or in the vicinity of this one, we perceive the most direct radiations: they are those big wavelength (color tending towards the Rouge), less diffused by the atmosphere.
When we direct our glance elsewhere in the sky, we perceive radiations whose trajectory starting from the sun is very indirect: they are those short wavelength (color tending towards the purple one), very diffused by the atmosphere.
The color of the sky is at the origin of several names of colors belonging to the chromatic Champ blue: Blue celestial sky, Blue, Blue céruléen, etc
Visible spectrum
The human eye perceives only the Lumière said, by definition, visible , whose Wavelength lies between that of the red , long, and that of the Violet, short: to see electromagnetic Spectrum.When all the frequencies are present in equivalent proportion, one perceives the white light of the full sun . But the various frequencies do not react in the same way to several phenomena.
- absorption
- Refraction
- reflection
- Dispersion
- diffusion
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