When the angle of incidence is `60^(@)` on the surface of a glass slab, it is found that the reflected ray is completely polarized. The velocity of light in glass is

Options

A. `sqrt(2)xx10^(8)ms^(-1)`
B. `sqrt(3)xx10^(8)ms^(-1)`
C. `2xx10^(8)ms^(-1)`
D. `3xx10^(8)ms^(-1)`

Answer

B

Explanation

As reflected light is completely polarized, therefore, `i_(p)=60^(@)`
`mu="tan"i_(p)="tan"60^(@)=sqrt(3)`
As `mu=(c)/(v) :.v=(c)/(mu)=(3xx10^(8))/(sqrt(3))=sqrt(3)xx10^(8)ms^(-1)`