Does light travel faster in air than in water? Why? - Vidyadip

Question

Does light travel faster in air than in water? Why?

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Answer

Yes, light travels faster in the air than water. Because light does not require any medium for their propagation and they are not mechanical waves. The quantities which oscillate in light are mechanical and electric fields. And electric and magnetic fields decrease with the medium in between them. So, light travels faster in the air than water.

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