Question

What is speed of light in vacuum and how does change in materials?

Answer 1

Speed of light in vaccum = 3 × 10 ^8 m/s or 3 × 10^5 km/sec.

This is commonly represented by "c".

Now , if the light is travelling in some medium other than vaccum then the speed of light depends upon the refractive index of that medium.

Speed of light in a medium whose refractive index is n , is given by

V = c/n where c is the speed of light in vaccum and n is the refractive index of the medium . For example, the refractive index of water is 1.33 .

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