Question

state and explain brewsters law for polarisation by reflection -3 mark question​

Answer 1

It has been observed experimentally that the reflected and refracted rays are at right angles to each other, when the light is incident at polarising angle. ... The tangent of the polarising angle is numerically equal to the refractive index of the medium.

Brewster’s law, relationship for light waves stating that the maximum polarization (vibration in one plane only) of a ray of light may be achieved by letting the ray fall on a surface of a transparent medium in such a way that the refracted ray makes an angle of 90° with the reflected ray. The law is named after a Scottish physicist, Sir David Brewster, who first proposed it in 1811.