Unpolarised light is incident on a medium at an angle of incidence 60°. The reflected ray is perpendicular to the refracted ray. Refractive index (μ) of the medium is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 1.73
According to Brewster's law,
$\tan θ_B=μ$
where,
$θ_B$ = Brewster Angle
$μ$ = Refractive index
$∴μ=\tan(90°-60°)$
$=\tan 30°$
$≃1.732$