What is speed of light in a denser medium of polarising angle 30 degrees?

Dear Student, 
For Any medium
Refractive Index (μ) and Polarising Angle (ψ = 30°) is related with :
μ=tanψμ=tan30°μ=13       ............  1
But, We Also Know that 
μ=CV
Here, C= Speed of Light in Vacuum
        , V= Speed of Light in taken medium
Also Using 1
μ=CV13=3×108VV=5.19×108 m/s

Regards
 

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