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When the angle of incidence is 60^(@) on...

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

A

`sqrt(3) xx 10^(8) m//s `

B

`2 xx 10^(8) m//s `

C

`3 xx 10^(8) m//s `

D

`sqrt(2) xx 10^(8) m//s `

Text Solution

Verified by Experts

The correct Answer is:
A
When the reflected ray is compoletely plane polarised , the corresponding angle of incidence of ` 60^(@)` is the polarising angle.
`:.` By Brewster' law `n=tan i_p= tan 60^(@)=sqrt(3)`
`:. ""n=(C)/(V_g)`
`:. V_g=(C)/(n)=(3 xx 10^(8))/(sqrt(3))=sqrt(3) xx 10^(8) m//s `
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