The following items are positioned in sequence: a source of a beam of natural light of intensity i0, three ideal polarizers a, b, and c; and an observer. polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. the axis angle of polarizer a is set at 0° (vertical), and the axis angle of polarizer c is set at 50°. the axis angle of polarizer b is set at 120°. what is ratio of the intensity of the beam at the observer to the intensity i0 of the source?
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