Polarisation

The blue colour of the sky is due to the phenomenon of

Two Polaroids and are placed with their axis perpendicular to each other. Unpolarised light is incident on . A third polaroid is kept in between and such that is axis makes an angle 45 with that of .The intensity of transmitted light through is : -

Two Polaroids P₁ and P₂ are placed with their axis perpendicular to each other. Unpolarised light l₀ is incident on P₁. A third polaroid P₃ is kept in between P₁ and P₂ such that its axis makes an angle 45º with that of P₁. The intensity of transmitted light through P₂ is