Two polaroids A and B are placed with their polaroid axes 30 o to each other as shown in the figure. A plane polarised light passes through the polaroid A and after passing through it, intensity of light becomes I 0 . What is the intensity of finally transmitted light, after passing through the polaroid B ?

Step-by-step solution

The intensity I of the transmitted light varies directly as the square of the cosine of the angle between the transmission direction of polariser and the analyser. I = I 0 cos 2 ⁡ θ Intensity of finally transmitted light after passing through the polaroid B is given by I = I 0 cos 2 ⁡ θ (Intensity) I = I 0 ⋅ cos 2 30 o I = 0.75 I 0 where, I 0 is the maximum intensity of transmitted light.