Unpolarized light of intensity 80W/m2 passes successively through three ideal polarizers. The first polarizer’s axis is vertical (0°), the second is oriented at 30° to vertical, and the third is oriented at 90° to vertical. What is the final transmitted intensity?
a) 15W/m2
b) 7.5W/m2
c) 0W/m2
d) 17W/m2