In Figure (a) below, unpolarized light is sent into a system of three polarizing

Question

In Figure (a) below, unpolarized light is sent into a system of three polarizing sheets. The angles theta_1, theta_2, and theta_3 of the polarizing directions are measured counterclockwise from the positive direction of the y axis (they are not drawn to scale). Angles theta_1 and thwta_3 are fixed, but angle theta_2 can be varied. Figure (b) gives the intensity of the light emerging from sheet 3 as a function of theta_2. (The scale of the intensity axis is not indicated.) What percentage of the light's initial intensity is transmitted by the system when theta_2 = 40 degree? Number ______ Units _____ the tolerance is +/-2%

Explanation / Answer

Here ,

let the initial intensity of unpolarized light is Io

output intensity = Io * 0.50 * cos^2(40) * cos^2(40)

output intensity = 0.172 * Io = 17.2 %

the output intensity is 17.2 %

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