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The speed of light in air is approx 299,700,000 metres per second. This is not very different from its maximum speed which is its speed in vacuum: 299,792,458 metres per second. The fact that the beam emerges from water is irrelevant.

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10y ago

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Is it possible to travel at the speed of light in water?

No, it is not possible to travel at the speed of light in water. Light travels at a slower speed in water compared to its speed in a vacuum, which is about 299,792 kilometers per second. The speed of light in water is approximately 225,000 kilometers per second.


Which formula you use to calculate for the speed of light in water?

Speed of light in water = speed of light in vacuum/refractive index of water


What percentage of the speed of light in vacuum is the speed of light in water?

When light with wavelength of 589 nanometers moves through water at the temperature of 20° C, its speed is 75% of the speed of light in vacuum.


Does light speed up as it travels through water?

No, light does not speed up in water, it slows down.


Is the speed of light in water should be more than the speed of light in a vacuum?

No. Light slows down whenever it passes through water. Nothing is faster than the speed of light in a vaccum.


What is the speed of light in water given that the water has a refreactive index of 1.333?

Use the relation:speed in a medium = speed of light in a vacuum / refractive indexi.e. v=c/nHencev = 300000000/1.333 = 225060000 m/s


How does the speed of light change when it enters the water?

That would depend what it enters from. If the light is transitioning from air to water,its speed decreases. If it's going from jello to water, its speed increases.


Should the speed of light in water be faster that the speed of light in a vacuum?

No, it shouldn't. And it isn't.


What is the difference in the speed of light in air, water, and glass?

The speed of light is fastest in air, slower in water, and slowest in glass.


Light incident upon a pane of glass shows down in passing through the glass. Does it emerge at a slower speed or at its initial speed?

The speed of light depends on the electrical characteristics of whatever medium it happens to be in at that instant. It has one speed in vacuum, another speed in air, another in glass, another in water, and yet another speed in jello. When passing from a more-optically-dense medium to one where its speed is higher, it doesn't need a stomp on the gas to 'accelerate' to the higher speed.


Is the speed of light greater or lesser in air than in water?

The speed is the same. Light travels at a finite speed.


Who determined the speed of sound in water?

it was faucault who first measured the speed of light in water ......