Physics

1- In the figure, initially unpolarized light is sent into a system of three polarizing sheets whose polarizing directions make angles of θ₁ = θ₂ = θ₃ = 41° with the direction of the y axis. What percentage of the initial intensity is transmitted by the system?

2- In Figure (a) below, unpolarized light is sent into a system of three polarizing sheets.The angles θ₁, θ₂, and θ₃ of the polarizing directions are measured counterclockwise from the positive direction of the y axis (they are not drawn to scale). Angles θ₁ and θ₃ are fixed, but angle θ₂ can be varied. Figure (b) gives the intensity of the light emerging from sheet 3 as a function of θ₂. (The scale of the intensity axis is not indicated.) What percentage of the light's initial intensity is transmitted by the three-sheet system when θ₂ = 92^o?