1. The problem statement, all variables and given/known data What is the most light that can be transmitted through 3 linear polarizers if you start with light polarized in the (i unit vector) direction and end with light polarized in the (j unit vector) direction for theoretically perfect polarizers 2. Relevant equations and attempt at solution. Well I reason since the light is already polarized, I need to use the cosine squared law I=IoCos^2∅ Where I is the intensity after going through a polarizer and Io is the initial intensity. So the light in already polarized through the i direction, here in what I am thinking, If I send this light through 2 polarizers who's filters are parallel with the light in the i direction, then then angle is zero and all the light is retained. But when I send it through a third filter in the j direction, as required in the problem, that is perpendicular to i of course, then no light emerges. I know these are theoretically perfect polarizers but my result seems counterintuitive. Is this right?