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how to calculate speed of light in different mediums. Light travels at approximately 300000 kilometers per second in a vacuum which has a refractive index of 10 but it slows down to 225000 kilometers per second in water refractive index 13. V lead cn lead 299792458 x 10 8 ms 26 12 x 10 8 ms 26 x 10 8 miles per hour.
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The refractive index of air for visible light is about 10003 so the speed of light in air is about 90 kms 56 mis slower than c. The first successful measurement of the speed of light took place in 1676. The critical angle for light refracting from I to II medium will be The critical angle for light refracting from I to II medium will be.
The first successful measurement of the speed of light took place in 1676.
The speed of light is constant for any observer in an inertial frame of. Using the definition of n we can find the speed of light through lead. Danish astronomer Ole Romer was trying to measure the orbit of Io Jupiters third largest moon by watching how long it. Different media reduce that speed by different amounts depending on their optical density.
