Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum ?
Let the rotating polaroid sheet makes an angle θ with the first polaroid.
.'. Angle with the other polaroid will be (90 - θ)
Applying Malus'* law between P1 and P3
Between P3 and P2
=>
.'. Transmitted intensity will be maximum when
θ = π/4
