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What is the speed of light in a glass fiber optic cable with a refractive index of 1.52?
In any medium whose refractive index is 1.52, the speed of light is c/1.52 = 0.658 c =197,231,880 meters per second (rounded)
How does the speed of light in glass compare to the speed of light in a vacuum?
It will depend on the type of glass, and something called its refractive index. All materials have a refractive index which will effect the speed of the light through it. The speed of light through a vacuum is 3.0x10^8 m/s, and a material such as glass will be lower than this.
Why does glass have different refractive index for light beams of different colours according to wikipedia?
It is not just glass, it is true for all media though which light can travel. If water [raindrops] did not, then you would never have a rainbow! The refractive index of a medium is a measure of the average refraction - as measured for white light. In fact, the angle of refraction depends on the wavelength of the light.If the two interfaces between the two media (air to glass and glass to air, for example) are parallel then the different refraction at the first interface is exactly offset what happens at the second interface. So a beam of white light gets split up into the spectrum at the first and recombines into a beam of white light at the second interface. However, if the two interfaces are not parallel - as in a prism, or a raindrop, the result will be white light being split into the spectral components.
What causes dispersion of light?
White light is made up of 7 colours. When put through a prism like a raindrop or a glass block, the 7 colours all travel at different speeds, because some slow down more than others. Thus, light is dispersed into it's spectrum
What are some examples of osmosis?
1.Wrinkling skin in water 2. plants moving water to stem 3.a substance moving through a barrier
