Light from an ordianry source(say a sodium lamp) is passed through a polaroid sheet `P_1`.The transmitted light is then made to pass through a second polaroid sheet `P_2`,which can be rotated so that the angle `(theta)` betwen the two polaroid sheets varies from `0^@` to `90^@`.Show graphically the variation of he intensity of light transmitted by `P_1` and `P_2` as a function of the angle `theta`.Take the incident beam intensity as`I_0`.
Why does the light from a cleear blue portion of the sky,show a rise and fall on intesnity,when viewed through a polaroid ,which is rotated?