When angle of incidence of material is 60° the reflected light is completely polarised. Then the velocity of the refracted ray inside the material is
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According to brewsters law...
TanΦ=mu
Thus
refractive index of material is √3...
So we know that...
Mu =c/v
Vel. In medium =c/mu
=3*10^8/√3
√3 * 10^8
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