00:01
In this question, we have unpolarized light passing through three polarizers.
00:06
We are given that data 1 is 20 degrees, data 2 is 60 degrees, data 3 is 40 degrees.
00:16
We want to find the intensity that emerges out through the tree polarizers.
00:25
So i'm going to label the intensity, initial intensity to be identified.
00:30
Not after passing through first polarizer i1 second polarizer i 2 and then the final polarizer i 3 okay so to do this question we'll just find the intensity step by step so after polarizer 1 i 1 equals to half i0 then after polarizer 2 i 2 is i1, cosine square, data 1 2.
01:19
The angle between the two polarizing axis will be 40 degrees, okay? so this is half, i0, cosine square, 40 degrees, and then after polarizer 3, i3 is i2, cosine square, data 2 3.
01:45
So from a diagram, data 2 3 is, so here there's a 30 degrees from the to the horizontal...