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12) Unpolarized light is sent through three polarizers. The axis of the first is vertical, the axis of the
second one makes an angle 30 (0 < 90°) clockwise from the vertical, and the angle of the third
one makes an angle 20 clockwise from the vertical.
a) Determine the intensity of the light passing each of the polarizers.
b) Determine the value of 0 for which no light passes the three polarizers.

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