The speed of an electromagnetic wave traveling in a transparent nonmagnetic substance is v = 1/ κμ0ε0 , where κ is the dielectric constant of the substance. Refractive index of water is 4/3. Answering those questions takes us on an amazing journey through space, time, physics and measurement, and the tale hasn't quite been told yet. In water, light travels at 75 percent the speed it would in the vacuum of outer space, but the electrons created by the reaction inside of the core travel through the water faster than the light does. The refractive index of water is - and of glass is. dekameters/second or speed of light [water] The SI derived unit for speed is the meter/second. Determine the speed of light in water, which has a dielectric constant of 1.78 at optical frequencies. Substituting the values in the formula for refractive index : refractive index of water = Speed of light in air / Speed of light in water. Speed of light in water = 3 * 10⁸ * 3 / 4. Therefore, refractive index of the water can be measure by the Speed of light in water is 2.25 × 10^8 m/s. It is denotes as n = c / v, v = c / n= 3 × 10^8 m/s / (1.33) = 2.25 × 10^8 m/s. Speed of light in vacuum is 3x100m s. 2. ), clocking in at a great 2.99 x 10 8 m/s. What is the refractive index of glass with respect to water? But nothing ever travels faster than c. The amount by which light slows in a given material is described by the index of refraction, n. The index of refraction of a material is defined by the speed of light in vacuum c divided by the speed of light through the material v: n = c/v asked Aug 3, 2019 in Class X Science by aditya23 (-2,145 points) The speed of light in water is 2.25 x 10 8 m/s. Refractive index = Speed of light in vaccum / Speed of light in water. Ked light of wavelength 6600 travelling in air gets refracted in water. Speed of light in air = 3 * 10⁸ m/s . Note that rounding errors may occur, so always check the results. The speed of light in a vacuum is 299,792,458 metres per second, a figure scientists finally agreed on in 1975 – but why settle on that figure? The speed of light in water is 2.25 x 108 m/s If the speed of light in vacuum be 3 x 108m/s calculate the refractive index of water. Question By default show hide Solutions. We have to find Speed of light in water. 1 meter/second is equal to 0.1 dekameters/second, or 4.4364024692431E-9 speed of light [water]. 4 / 3 = 3 * 10⁸ / Speed of light in water. And why does it matter? State the speed of light in (a) air, (b) water, and (c) glass. The Fizeau experiment was carried out by Hippolyte Fizeau in 1851 to measure the relative speeds of light in moving water. How fast does light travel, and does it travel faster in water or air? Fizeau used a special interferometer arrangement to measure the effect of movement of a medium upon the speed of light. 0 votes . Speed of light in Air - 3 × 10 8 ms-1 or 300000 km/h Water - 2.25 × 10 8 ms-1 13.3k views. 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