Three polarizing plates whose planes are parallel arc centered on a common axis.

Question

Three polarizing plates whose planes are parallel arc centered on a common axis. The directions of the transmission axes relative to the common vertical direction are shown in the figure below. A linearly polarized beam of light with the plane of polarization parallel to the vertical reference direction is incident from the left on the first disk with intensity If = 14.9 units (arbitrary). Calculate the transmitted intensity, If, when 0t = 20.7degree. Do not enter units. Make repeated use of Malus's law. submit Answer Incorrect. Tries 1/20 Previous Tries Calculate the transmitted intensity, If, when 02 = 38.0degree. Do not enter units. Submit Answer TrieS 0/20 Calculate the transmitted intensity, If, when theta3 = 59.5degree. Do not enter units. Submit Answer TrieS 0/20

Explanation / Answer

For 1= 20.7 deg

If = I1 = I0*cos2 1 = 14.9*cos220.7 = 13.0 unit

For 2= 38.0 deg

If = I2 = I1*cos2 2 = 13.0*cos238.0 = 8.1 unit

For 3= 59.5 deg

If = I3 = I2*cos2 2 = 8.1*cos259.5 = 7.8 unit

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