Q.No.140: - Why the speed of light is different in different material rather than vaccum?

         Q.No.140: - Why the speed of light is different in different material rather than vaccum?

        Ans: - The light is basically an electromagnetic wave. When light enters in a material then electric and magnetic properties of the medium effect on the electric and magnetic components of the light (electromagnetic wave) that’s why the speed of light in matter changes. Materials that transmit light are normally non-ferromagnetic