A narrow beam of white light is passed through a triangular prism. It is then separated into a band of colours
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Least deflected is red, most deflected is violet.  The way to remember it is the name Roy G. Biv\n\nRed\nOrange\nYellow\nGreen\nBlue\nIndigo\nViolet
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Your eyedoctor is right. A prism is shaped like a triangle.On one end is the base and at the other end is a point. This is put in a optical lens to deviate the light.\n\nIn some hard contact lens a ballast can be put to keep it position. A ballast is like a prism but it is not used to deviate light like in a prescription lens.
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Light is refracted from a single point. Since the light which gets refracted into the same colors is all the same distance from the point source, a circle is formed.\n\n-Wied
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The water refracts visible lightwaves into its varying freqencies.\n\nRed, Orange, Yellow, Green, Blue, Indigo, and Violet.  It forms the acrostic, ROYGBIV.
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It is because of the air bending the light slightly. Its the same as shining a light through water, but the effects are less pronounced.
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What happens here is the reverse of dispersion that is the spectrum of colours obtaines which u see as the colours of rainbow or light emerging out of prism. When u spun the top all the colours get mixed to form their parent colour which is white. The same phenomenon is evident when wheel decorated with all the colours of rainbow is rotated fast.
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Because light travels at different speeds when travelling through different materials, the light seems to bend.
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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.
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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
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a prism-oops to late--http://en.wikipedia.org/wiki/Triangular_prism actually a triangular prism. Thanks :-)
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A photon with a wavelength of about 650 nm
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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.
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compound light microscope
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A Prism bends the light and separates it to the different colors, usually seen as rainbow colors or primary colors that all other colors come from the blending of these colors in one way or another.  An optical instrument gathers light bends it and projects it to your eye on the correct focal lengnth through the ocular lens or eyepiece.  It is the focusing of the instument that puts the color right again and projects the image to your eye.  You do not look through an optical instrument it is actually projecting an image to your eye the way a projector projects a movie to a screen.
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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.
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If you are asking about light (beams of) then the answer is white.  A prism separates a beam of light into its component parts, producing a "rainbow".  Natural sunlight near mid-day is considered white light.  Sunlight reflected from a white surface likewise can be refracted into a rainbow spectrum because that surface is reflecting all colors of the spectrum.\n\nIf you are talking about pigments, then the combination of all colors is a dark, muddy mess of indeterminate color.
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What you are describing is a result of light reflecting off a concave surface.  The best way to explain this is like this:\n\nDraw a big T on a piece of paper.\nNow draw a line from the lower right side to the vertex of the T (that's the intersect).  This represents light coming in.\nNow draw another line from the vertex to a point at the same location as the origin of the other line, but on the lower left.  That is the light leaving.  The angles of both lines converging on the crossing of the T should be the same.  Same with any beam of light.  It is reflected at the same angle as it is received.\n\nA spoon is a reflecting concave mirror.  If you could get close enough to the spoon you could see your image right side up.  But when you are further out than the focal distance the image inverts because the beams cross over each other.