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

Question

When the angle of incidence on a material is 60° , the reflected light is completely polarised. The velocity of refracted ray inside the material is, (A) 3× 108ms- 1 (B) (3/√2)× 108ms- 1 (C) √3× 108ms- 1 (D) (1/3)× 108ms- 1

Tardigrade Admin · Accepted Answer

According to Brewster's law, tanθ =μ ⇒ μ =tan60° ⇒ μ =√3 . Speed of light in the medium is, V=(C/μ )=√3× 108ms- 1 .

Q. When the angle of incidence on a material is $6 0^{\circ}$ , the reflected light is completely polarised. The velocity of refracted ray inside the material is,

$3 \times 1 0^{8} m s^{- 1}$

$\frac{3}{2} \times 1 0^{8} m s^{- 1}$

$3 \times 1 0^{8} m s^{- 1}$

$\frac{1}{3} \times 1 0^{8} m s^{- 1}$

According to Brewster's law,
$t an θ = μ$
$\Rightarrow μ = t an 6 0^{\circ}$
$\Rightarrow μ = 3$ .
Speed of light in the medium is,
$V = \frac{C}{μ} = 3 \times 1 0^{8} m s^{- 1}$ .

Q. When the angle of incidence on a material is 60∘ , the reflected light is completely polarised. The velocity of refracted ray inside the material is,

3×108ms−1

2​3​×108ms−1

3​×108ms−1

31​×108ms−1

According to Brewster's law, tanθ=μ ⇒μ=tan60∘ ⇒μ=3​ . Speed of light in the medium is, V=μC​=3​×108ms−1 .

Q. When the angle of incidence on a material is $6 0^{\circ}$ , the reflected light is completely polarised. The velocity of refracted ray inside the material is,

$3 \times 1 0^{8} m s^{- 1}$

$\frac{3}{2} \times 1 0^{8} m s^{- 1}$

$3 \times 1 0^{8} m s^{- 1}$

$\frac{1}{3} \times 1 0^{8} m s^{- 1}$

According to Brewster's law,
$t an θ = μ$
$\Rightarrow μ = t an 6 0^{\circ}$
$\Rightarrow μ = 3$ .
Speed of light in the medium is,
$V = \frac{C}{μ} = 3 \times 1 0^{8} m s^{- 1}$ .