Question

When the angle of incidence on a material is $60^\circ $ , the reflected light is completely polarised. The velocity of refracted ray inside the material is,

• A. $3\times 10^{8}ms^{- 1}$
• B. $\frac{3}{\sqrt{2}}\times 10^{8}ms^{- 1}$
• C. $\sqrt{3}\times 10^{8}ms^{- 1}$
• D. $\frac{1}{3}\times 10^{8}ms^{- 1}$

Answer 1

Answer: (C)

According to Brewster's law,
$tan\theta =\mu $
$\Rightarrow \mu =tan60^\circ $
$\Rightarrow \mu =\sqrt{3}$ .
Speed of light in the medium is,
$V=\frac{C}{\mu }=\sqrt{3}\times 10^{8}ms^{- 1}$ .