KEAM 2015 Physics and Chemistry Paper

Key Concept According to Brewster law, when a beam of unpolarized light is reflected from a transparent medium, the reflected light is completely plane polarized at a certain of incidence, called angle of polarization.
Given, Brewster's angle, θ=60∘
We know that, µ=tan‌θ.....(1)
⇒‌‌µ=tan‌60∘=√3
Now, ‌‌µ=‌

sin‌i

sin‌I

Angle of deviation inside the glass,
d=i−r=60∘−30∘=30∘