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What are the principles behind the use of polarizing filters in photography with respect to light polarization?

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Light of original intensity I0 passes through two idea polarizing filters having their polarizing axes oriented as shown in the figure. You want to adjust the angle so that the intensity at point P is equal to I0/12. (A) if the original light is linearly polarized in the same direction as the polarizing axis of the first polarizer the light reaches, what should the angle be? Express your answer in degrees.
What angle would the axis of a polarizing filter need to make with the direction of polarized light of intensity 1.90 kW/m2 to reduce the intensity to 40.0 W/m2? =____°
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