See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

If I is the intensity of the incident unpolarised light, the intensity transmitted by the first is I/2. This is the intensity of incident light on the second polaroid. Intensity transmitted by the second polaroid is 2 I cos 2 , where  is the angle between the axes. Here sin  = 3/5 therefore cos  = 4/5 2 2 I I 4 8 cos I 2 2 5 25          8 25 is the required ratio.