p34_035 - 35 Let I0 be the intensity of the unpolarized...

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Unformatted text preview: 35. Let I0 be the intensity of the unpolarized light that is incident on the first polarizing sheet. The transmitted intensity is I1 = 1 I0 , and the direction of polarization of the transmitted light is θ1 = 40◦ 2 counterclockwise from the y axis in the diagram. The polarizing direction of the second sheet is θ2 = 20◦ clockwise from the y axis, so the angle between the direction of polarization that is incident on that sheet and the polarizing direction of the sheet is 40◦ + 20◦ = 60◦ . The transmitted intensity is I2 = I1 cos2 60◦ = 1 I0 cos2 60◦ , 2 and the direction of polarization of the transmitted light is 20◦ clockwise from the y axis. The polarizing direction of the third sheet is θ3 = 40◦ counterclockwise from the y axis. Consequently, the angle between the direction of polarization of the light incident on that sheet and the polarizing direction of the sheet is 20◦ + 40◦ = 60◦ . The transmitted intensity is I3 = I2 cos2 60◦ = 1 I0 cos4 60◦ = 3.1 × 10−2 . 2 Thus, 3.1% of the light’s initial intensity is transmitted. ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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