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(C) According to Brewster's law,the refractive index $\mu$ of the material is given by $\mu = 	an(i_p)$,where $i_p$ is the polarizing angle (angle of

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$\sqrt{3} 	imes 10^8$

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(C) According to Brewster's law,the refractive index $\mu$ of the material is given by $\mu = 	an(i_p)$,where $i_p$ is the polarizing angle (angle of incidence for complete polarization).Given $i_p = 60^\circ$.Therefore,$\mu = 	an(60^\circ) = \sqrt{3}$.The refractive index is also defined as the ratio of the speed of light in vacuum $(c)$ to the speed of light in the medium $(v)$: $\mu = \frac{c}{v}$.Substituting the values: $\sqrt{3} = \frac{3 	imes 10^8}{v}$.Solving for $v$: $v = \frac{3 	imes 10^8}{\sqrt{3}} = \sqrt{3} 	imes 10^8 \ m/s$.

When the angle of incidence on a material is $60^\circ,$ the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in $m/s$)

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