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Polarization by reflection occurs when light is incident on a surface at i_b, Brewster Angle where the Brewster angle should be less than the critical angle i_c , otherwise total internal reflection will happen and the light will be transmitted without refraction.

Given light is incident from a medium of higher refractive index, i.e. n1>n2

Now the critical angle is , where n2<n1

Also Brewster angle is ,where n2<n1

For larger angles, , which means i_b<i_c

i.e. Polarisation will occur.