Show using a proper diagram how unpolarised light can be linearly polarised by reflection from a transparent glass surface.

Explanation

The diagram , showing polarisation by reflection is as shown . [Here the reflected and refreacted rays are at right angle to each other].
` therefore r= ( (pi )/(2)-iB) `
` therefore :mu =((sin i_s)/(sin r) =tan i_s) `
Thus light gets totally polarised by reflection when is is sincident at angle `l_s `
( Brewster.s angle ) . where `i_a =tan ^(-1) mu`