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Unpolarized light is incident on three polarizers: The first making an angle of 0 degrees with the vertical; the second making an angle of ? degrees with the vertical; and the last one making an angle of 90 degrees with the vertical. If the initial intensity is 1353 W/m2 and the final intensity is 108 W/m2, to the nearest tenth of a degree what is the angle of the middle one?

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