What is the speed of light in a denser medium of polarising angle `30^(@)` ?

Explanation

If a light ray passing through a denser medium is incident on air surface and the polarising angle
`i_(p)=30^(@)`, then `tani_(p)=(1)/(n_(d))=(v_(d))/(c)`, where `v_(d)=`speed of light in denser medium and `c=`speed of light in air.
`impliesv_(d)=ctani_(p)=(3xx10^(8))xx(tan30^(@))=sqrt(3)xx10^(8)ms^(-1)=1.732xx10^(8)ms^(-1)`.