The following are positioned in sequence a source of

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8) The following are positioned in sequence: A source of a beam of natural (non-polarized) light of intensity I o ; three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, from the perspective of the observer. The axis angle of polarizer A is set at zero degrees (vertical), and the axis angle of polarizer C is set at 50 degrees. The axis angle of polarizer B is set at 120 e . The ratio of the intensity of the beam at the observer to the intensity of the source is closest to:
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