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A beam of unpolarized light of intensity Io passes through a series of ideal pol

ID: 2207881 • Letter: A

Question

A beam of unpolarized light of intensity Io passes through a series of ideal polarizing filters with their polarizing directions turned to various angels as shown in the figure. A. what is the light intensity in terms of Io at points A, B ,C? B. if we remove the middle filter, what will be the light intensity at point C?

A beam of unpolarized light of intensity Io passes through a series of ideal polarizing filters with their polarizing directions turned to various angels as shown in the figure. A. what is the light intensity in terms of Io at points A, B ,C? B. if we remove the middle filter, what will be the light intensity at point C?

Explanation / Answer

At point A I = 1/2*Io Use Malus Law to find I at B and C IB = IA*cos^2(?) = 1/2*Io*cos^2(60) = 0.125*Io IC = IB*cos^2(?) = 0.125*Io*cos^2(30) = 0.09375*Io

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