The refractive index of water is 1.33. What will be the speed of light in water?
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Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3) and 200,000 kilometers per second in glass (refractive index of 1.5).
Light has constant speed, only its frequency and wavelength varies
Speed of light does not change, it has to travel more in a medium than in vacuum,
When light is passing through a medium, the electrons in the medium absorbs the energy from the light and gets excited and releases them back. This absorption and re emission of light gives objects colour. Thus light interacts with the particle in the medium, which causes delay. But it’s speed remains same, only it has to travel more distance in the given time, so it seems that it’s speed is varying but it is not.
It is impossible for any physical object to travel at or more than speed of light.
The only reason why a photon can travel at light speeds is because it is mass less.
Any object having mass when tires to reach light speeds their mass increases, called relativistic mass.
So as it accelerates to reach light speeds it becomes more massive and a infinite energy is required to reach light speeds.
Photons have no mass so it can travel at ‘c’
Now even light can’t travel faster than ‘c’, because if it does, it will also gain relativistic mass which acts as a deterrent for further increment in speed.
So max value anything can reach is “c”
Light has constant speed, only its frequency and wavelength varies
Speed of light does not change, it has to travel more in a medium than in vacuum,
When light is passing through a medium, the electrons in the medium absorbs the energy from the light and gets excited and releases them back. This absorption and re emission of light gives objects colour. Thus light interacts with the particle in the medium, which causes delay. But it’s speed remains same, only it has to travel more distance in the given time, so it seems that it’s speed is varying but it is not.
It is impossible for any physical object to travel at or more than speed of light.
The only reason why a photon can travel at light speeds is because it is mass less.
Any object having mass when tires to reach light speeds their mass increases, called relativistic mass.
So as it accelerates to reach light speeds it becomes more massive and a infinite energy is required to reach light speeds.
Photons have no mass so it can travel at ‘c’
Now even light can’t travel faster than ‘c’, because if it does, it will also gain relativistic mass which acts as a deterrent for further increment in speed.
So max value anything can reach is “c”
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Answer:
2.25 × 10⁸ m / sec
Explanation:
Given :
Refractive index of water = 1.33
Speed of light in air = 3 × 10⁸ m / sec.
We know :
Refractive index = Speed of light in air / Speed of light in water
Speed of light in water = Speed of light in air / Refractive index.
Putting value we get :
Speed of light in water = 3 × 10⁸ m / sec / 1.33 .
Speed of light in water = 2.25 × 10⁸ m / sec
Hence speed of light in water is 2.25 × 10⁸ m / sec
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