When light propagates through a material medium of relative permittivity ∈r and relative permeability µr ,

When light propagates through a material medium of relative permittivity ∈_r and relative permeability µ_r , the velocity of light, n is given by : (c-velocity of light in vacuum)

(1) v = √(u_r/∈_r)

(2) v = √(∈_r/u_r)

(3) v = c/√(∈_r/u_r)

(4) n = c

When light propagates through a material medium of relative permittivity ∈r and relative permeability µr ,

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