Question

what is the speed of light in vaccum​

Answer 1

Answer:

Speed of light

Unit of speed

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second.

Explanation:

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Answer 2

Speed of light in vacuum= 3.00×108 m/s. Refractive index is a measure of how much speed of light changes when it enter the medium from air.The speed of light is measured to have the same value of c = 3x108 m/s no matter who measures it.approximately 300,000 kilometers per second

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 of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).

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