Ficheiro:Light_dispersion_conceptual.gif
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Light_dispersion_conceptual.gif (700 × 435 píxeis, tamanho: 119 kB, tipo MIME: image/gif, cíclico, 8 quadros, 0,8 s)
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Descrição do ficheiro
DescriçãoLight dispersion conceptual.gif |
English: This is a conceptual animation of the dispersion of light as it travels through a triangular prism.
In vacuum (shown in black), light of any wavelength will travel at a fixed speed, c. But light slows down in a different medium (such as glass or water), and light of shorter wavelengths (like indigo) will tend to travel slower than light of longer wavelengths (like red) This model attempts to convey this fact and its consequences by idealizing light as small particles travelling in space. Of course, light is not made of small particles but of electromagnetic waves, so keep in mind this conceptual aspect of the image to avoid any misconceptions about the nature of light itself. For our purposes, however, the model will suffice. White light, represented here by white dots, is actually made out of light of several frequencies (colors) travelling together. These basic frequencies of visible light are part of what we call visible spectrum, and it is only tiny part of the entire electromagnetic spectrum. As white light enters a medium (in this case, the prism), each of its composing wavelengths will travel at a different speed in the new medium, and this change in speed is what bends the path in which light is travelling. This is the phenomenon we call refraction. The ratio between the speed of light in vacuum and the speed of light in a medium is what we call index of refraction, and this value is specific for a given wavelength and medium. Since light of different wavelengths will change direction by a different amount, we will experience a division of white light in its composing spectral colors, represented here by colored dots. This is what we call dispersion. Once the basic frequencies are separated in this animation, we can easily see the difference on their speeds. Red, with a long wavelength, passes through almost without any change, whereas indigo (with short wavelength) is left behind by all the other colors. However, this difference in speed does not hold in vacuum, and this can be seen on how all light exiting the prism will once again travel at the constant speed of light in vacuum. This is all just an easy way of seeing it, so it is important to stress once again the fact that this model is not entirely accurate, as light is not made of little round particles, and white light can't exist on its own (as can be misunderstood from the big white dots).Deutsch: Animation der Lichtbrechung in einem Prisma. |
Data | |
Origem | Obra do próprio |
Autor | Lucas Vieira |
Licenciamento
Public domainPublic domainfalsefalse |
Eu, titular dos direitos de autor desta obra, dedico-a ao domínio público, com aplicação em todo o mundo. Nalguns países isto pode não ser legalmente possível; se assim for: Concedo a todos o direito de usar esta obra para qualquer fim, sem quaisquer condições, a menos que tais condições sejam impostas por lei. |
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Um valor sem um elemento no repositório Wikidata
janeiro 2007
Histórico do ficheiro
Clique uma data e hora para ver o ficheiro tal como ele se encontrava nessa altura.
Data e hora | Miniatura | Dimensões | Utilizador | Comentário | |
---|---|---|---|---|---|
atual | 17h28min de 24 de fevereiro de 2007 | 700 × 435 (119 kB) | LucasVB | Changing "white photons" back to the same size as the colored ones. | |
17h32min de 1 de fevereiro de 2007 | 750 × 498 (117 kB) | Leyo | Auf eine alte Version zurückgesetzt | ||
11h39min de 23 de janeiro de 2007 | 750 × 498 (117 kB) | LucasVB | Larger "white" photons may give a better idea of "division of white light". Also, removed magenta color since it is not a spectral color (I don't know why I didn't do this earlier) | ||
16h54min de 21 de janeiro de 2007 | 700 × 435 (121 kB) | LucasVB | Once again, larger (700px), but now a constant stream of "photons", per request. The file is actually smaller now because we just need 8 frames. | ||
05h01min de 21 de janeiro de 2007 | 450 × 296 (379 kB) | LucasVB | Larger size. | ||
20h52min de 20 de janeiro de 2007 | 250 × 167 (265 kB) | LucasVB | Conceptual animation of w:dispersion of light. |
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