00:01
In the question, they are telling us there is unpolarized light, it is hitting the filter a, and after some distance it is hitting the filter b.
00:18
Now they're asking what should be the orientation of such that the light out of filter b should be completely blocked.
00:27
Now to solve this question, there is a principle called as malus law.
00:35
This law states that the intensity of the polarizing light transmitted through the analyzer the first one is called as the the second one is called the b is called as the analyzer varies with the square of the cosine between the angle so it varies between the angle the square of the cosine of the angle between the two one is the polarizer a and another is an analyzer b so it varies with the cause of the cause of square of the angle between these two polarizer and analyzer so if i have to tell the state it's the intensity of the polarized light transmitted through the analyzer varies as the square of the cosine of the angle between the plane of transmission and the transmission of analyzer and the plane of polarizer.
01:25
So if i have to write mathematically, intensity i, so output intensity let us call it as i equals i0, the incident intensity into cause of square of cosine of the angle between the two polar, colorizer and the analyzer.
01:45
Now since we want the output intensity i to be 0, so 0 equals i0, cos square theta and cos square theta equals 0...