1. The problem statement, all variables and given/known data What is the intensity of the electric field that can be transmitted through N linear polarizers if the polarization of the initially linear polarized light is to be rotated 90 degrees? 2. Relevant equations I=IoCos^2x 3. The attempt at a solution I am seeing like a Riemann sum forming, the infinitesimal being taken as it is rotated. That is about as much as I've got, some sort of rate of change as it is rotated infinitesimally. This is a 300 level optics class and my teacher makes the homework way too hard, in my opinion.