In Figure, unpolarized light is sent into a system of three polarizing sheets. The angles 1 2

In Figure, 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 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 = 90??

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0° 60° 120° 180