does the value of speed of light change with medium
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Yes. Light is slowed down in transparent media such as air, water and glass. The ratio by which it is slowed is called the refractive index of the medium and is usually greater than one. ... When people talk about "the speed of light" in a general context, they usually mean the speed of light in a vacuum.
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Is The Speed of Light Everywhere the Same?
The short answer is that it depends on who is doing the measuring: the speed of light is only guaranteed to have a value of 299,792,458 m/s in a vacuum when measured by someone situated right next to it. But let's approach the question by considering its various meanings.
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