The color of the sky manifestations are mainly due to the interaction of sunlight with the atmosphere. Sunlight is white, also called polychromatic (the sum of all the colors of the rainbow = white), and the atmosphere contains a certain amount of moisture, usually small, and dust and ash. When a ray of light passes through a material, its direction of propagation deviates from a certain angle, which depends on the type of material traversed. Transparent materials are typically characterized by a parameter called "refractive index" and its value depends on the color of light passing through the material. Thus, when passing through a material, each color contained in white light beam is diverted from a different angle, giving rise to known separation of light in various colors behind a prism. Each color contained in white light is characterized by a number called "wavelength" (its measure is the nanometer = one millionth of a meter).
deviation of the colors of light is maximum in the blue (shorter wavelength), ie they are the colors that change direction with respect to the initial white beam, and is minimal for the yellow and the red (higher wavelength) which are hardly deflected. Blue rays, once diverted, are bumping with other airborne particles, ranging from new trajectory. Therefore made a zigzag course through the atmosphere to reach us. Continue Reading ...
is why our eyes when they appear to come from all parts of the sky. The yellow rays do not appear nearly diverted and this is the reason that the sun will appear yellow. When the sun is very low ... in the sky its rays pass through a great thickness of air and light rays interact more often with the particles in the atmosphere. The blue and violet are scattered to the sides more strongly than are the yellow and red, which continue to spread in the line of sight of the sun, making these magnificent sunsets on Earth. Interaction between light and small particles Generally, when an electromagnetic wave (such as sunlight) falls on a single atom or small molecule interacts with a cloud of electrons attached, communicating energy to the atom. This makes the lowest energy level of the atom (the ground state or natural) is put into vibration. These oscillating electrons in this state do not remain long, but returning to its base rerradiando some part of the energy initially absorbed. This means that if the incident light is white, consisting of waves of different wavelength (different color), light reissued contain as many colors with small wavelength (blue and violet) with large wavelength (yellow and red). Therefore reached the same conclusion, when the light hits these small particles, forward, blue and violet waves and it is these that we see. Interaction between light and large particles. Particles to be called "great", should be larger than the wavelength of light. The behavior of large particles in the atmosphere here is like a mirror, without preference for any color component of incident white light. This type of interaction occurs with the clouds of heaven, which are composed of water droplets large colorless. These drops reflect like a mirror polychromatic white light falling on them without altering their color. So they appear as white clouds in the sky. All this goes without saying, it's only explanation for our sense of vision as different organisms on this planet are the same object or phenomenon in different ways ... also fascinating, no?
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