Question
State Brewster's law.
The value of Brewster's angle for a transparent medium is different for light of different colours. Give reason.
Solution
Brewster discovered a relation between polarising angle, ip and the refrcative index n of the transparent material with respect to the surrounding medium.
The law is given by,
When a light is incident on a transparent surface at the polarising angle, the reflected and the refracted rays are perpendicular to each other.
The lights of different colours have different wavelength hence, there are different values of refractive index for a medium. That is why these lights have different values of brewster's angles.
The law is given by,
When a light is incident on a transparent surface at the polarising angle, the reflected and the refracted rays are perpendicular to each other.
The lights of different colours have different wavelength hence, there are different values of refractive index for a medium. That is why these lights have different values of brewster's angles.
