why does a prism split the white light into seven colors ?
354651
Well the white light is a mixture of a large number of wavelengths of lights. These different wavelengths of lights travell at different speed in the medium such as glass. In air and vacuum the have alsmost the same speed. But in prism the travell with t&#92;different speeds. So when the pass prism the length of path travelled in the same times is different and hence when the emerge out, the different colrs are at differemt positions resulting in a seperation of colours.\n    This is called the dispersion of light.
627081
It is refraction, which deals with specific properties of materials and the angle at which the light enters and exits the material.\n\nA prism in effect splits a ray of light in a manner that a really sharp knife could split a strand of hair.
231058
Light hits water droplets and gets divided into seperate colors like the prism effect.
30370
There are different colors of light that make up white light. Each color bends by a different amount when it enters a slow medium, like the glass of a prism or the water of a rain drop. Red bends the least, and violet bends the most. When the different colors bend from passing through a slow medium, they get separated, as in a rainbow. \n\nBy the way, if you see a rainbow from an airplane, it will not be an arc, but can be a complete circle. \n\nAlso, sometimes you can see a 2nd fainter rainbow next to the first, with the colors in the opposite order. \n\nIn the laboratory, it is possible to see a 3rd rainbow, fainter still, and even 4th, 5th,...and even 12th rainbows from a single drop of water, and as many as 19 rainbows from a stream of water! \n\nThere are also even more interesting "supernumerary" rainbows with other color orders that appear just under the main rainbow or sometimes the secondary rainbow, that you might have observed sometimes. Look at the pictures in the references I found.
928161
OK, this question doesn't make sense, for two reasons:\n\n1.) Colors, by definition, are at different wavelengths. If the beam has 2 color components, each component would have it's own wavelength.\n\n2.) Your question at the end isn't a proper sentence, and is leaving a necessary part out.
214578
It will be used in reference to a prism.\n\norange light has more wavelength thanx yellow.
672709
To answer this question, you should know that the white light is made up of seven different colors (violet, indigo, blue, green, yellow, orange and red). When sunlight (which is white colored) hits the Earth's atmosphere the blue components of the white light bend so much that it seems like they surround the Earth causing the sky to look blue. \nThe seas llok blue because they act like a mirror and they reflect the sky. The sea color is darker than the sky because of the depth of the seas (Beer-Lambert's Law). The rivers are not suppose to be deep and that's why they don't appear blue. If human eyes were really strong then we could have seen that the rivers are slightly blue.
251505
When water falls, it becomes a mist. Then light refraction occurs and the wave length changes. It looks white because it scatters the light. I also creates rainbows because of the light refraction.
385070
Sorry but clear isn't a colour. And i think  a prism is a refraction of light not a reflection.In optics, a prism is a device used to refract light, reflect it or break it up (to disperse it) into its constituent spectral colours (colours of the rainbow). The traditional geometrical shape is that of a triangular prism, with a triangular base and rectangular sides. Some types of optical prisms are not in fact in the shape of geometric prisms.\n\nAs light moves from one medium (e.g. air) to another denser medium (the glass of the prism), it is slowed down and as a result either bent (refracted) or reflected. The angle that the beam of light makes with the interface as well as the refractive indices of the two media determine whether it is reflected or refracted, and by how much (see refraction, total internal reflection).\n\nReflective prisms are used to reflect light, for instance in binoculars, since they are easier to manufacture than mirrors. Dispersive prisms are used to break up light into its constituent spectral colours because the refractive index depends on frequency (see dispersion); the white light entering the prism is a mixture of different frequencies, each of which gets bent slightly differently. Blue light is slowed down more than red light and will therefore be bent more than red light. There are also polarizing prisms (also known as birefringent prisms) which can split a beam of light into components of varying polarization.\n\nIsaac Newton first thought that prisms split colours out of colourless light. Newton placed a second prism such that a separated colour would pass through it and found the colour unchanged. He concluded that prisms separate colours. He also used a lens and a second prism to recompose the rainbow into white light.
1135249
The proof is red-shift.\n\nAs things recede from each other at a high fraction of c (speed of light), the waves stretch out; visible light takes on a higher red content.  The SPEED of light remains the same, but the frequency changes.\n\nConversely, when things approach each other, they blue-shift; the light becomes more blue.
368659
No, as da 1st prism 'll split it into da spectrum (VIBGYOR) & da 2nd 'll just refract da spectrum & not convert it again into white light.
601948
Originally a spectrum was what is now called a spectre, i.e., a phantom or apparition.\n\nWhen white light is passed through a prism, colours 'appear' as if from nowhere, so this is where the link comes from
100159
The quote from the link explains how yellow is a combination of colors and when added to blue all the colors are represented and the result is white light.  This has to do with the fact that the normal human eye has only three different color receptors and many colors we see are mixtures. \n\n"White is the combination of all colors of light. In other words, the color white is seen when the red, green and blue channels all send signals to the brain. It follows that red light plus green light plus blue light produces white light. However red plus green without the blue produces yellow. By deduction, yellow light plus blue light most produce white light."
642130
The best way to learn is by doing, And it is a difficult concept to understand that light can be broken.\n\nI would reccommend that you use prisms to break up the light into spectrums. you can use chandelier crystals or something like that.\n\nThen you can have them put the light back together: Heres how: get three slide projectors, and get some colored acetate in cyan (turquoise). magenta, and yellow to place in front of the projection lenses OR Better Yet take slides of peices of paper that are these colors and place one in each of the slide projectors. If you angle the projectors so that the projections overlap, it should form white light.
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Actually a rainbow contains the entire visible light spectrum. Our words and terms for individual colors is (somewhat) arbitrary.\n\nThere is nothing inherent in physics of color or our eyes why, for instance, light with a wavelength around 470 nanometers should be a distinct color (in this case blue). It seems like a strange idea, because our use of language cements the notion that these colors are somehow special when compared to light at intermediate wavelengths.\n\nTests have been done with children of different cultures to see if there is some hardwired circuitry in the human brain to identify distinct colors the same way. In other words, we see red, blue, green, but does another culture see (what we call) purple, blue-green, and yellow-orange as their primary colors?\n\nAs an aside it is interesting to note that ancient Greek and Roman texts, for instance, tend to have a lot fewer color terms than modern works of literature. \n\nAn early test in the 19th century where anthropologists did the ask-kids-color test suggested that in other cultures people tend to pick out colors from the base set of 11 in English (red, yellow, green, blue, brown, purple, pink, orange, black, white, and grey) - suggesting that there is something to the idea that these colors are hardwired into the brain.\n\nOn the other hand, at least one more recent study found the opposite - that when shown a selection of hues children from another culture did not pick out the 11 English terms as special or primary.\n\n(Later of course the system gets refined, as physics lets us know how to combine colors in different situations. That is, once you pick "blue" as one of your special colors, then physics demands that the other primary colors are red and yellow. But it is not unique. If you start with purple then blue-green and yellow-orange are the other primary colors.)\n\nBut, regardless of whether or not some colors are hardwired into the brain, a rainbow shows a continuous spectrum across the visible light range and beyond - extending slightly into the infrared and ultraviolet regions.\n\nSo, the reason why a rainbow has the 7 primary colors is that these are the ones which we have identified and named as being "special."
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Basically white is the combination of all colors and therefore can reflect all colors (light is the combination of colors).\nBlack is the absence of color and therefore absorbs the light (colors).
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It is due to refraction, not diffraction.  Red is not bent the most in a prism, violet is bent the most.  \n\nWhen the sun is on the horizon, its light has to travel through many miles of atmosphere before it gets to our eye.  Since the blue end of the spectrum is bent the most through refraction, it is completely scattered away by the time the light gets to us.  Therefore, the only colors left are the red and orange.\n\nThis is the same reason the sky is blue (no it is not blue because of the reflection of the oceans!)  The blue end of the spectrum is scattered the most, thus illuminating the sky more than the other colors.  Actually, since violet is bent more than blue, the sky is actually more a violet color, but our eyes are more sensitive to blue, so we see a blue sky.