I don\'t understand the answer given in textbook help. Can someone please help?

Question

I don't understand the answer given in textbook help. Can someone please help?
Three polarizing plates whose planes are parallel are centeredon a common axis. The directions of the transmission axes relativeto the common vertical direction are shown in the figure below. Alinearly polarized beam of light with plane of polarizationparallel to the vertical reference direction is incident from theleft onto the first disk with intensity Ii =11.0 units (arbitrary). Calculate thetransmitted intensity If when1 = 24.0°,2 = 41.0°, and3 = 59.0°. (Hint:Make repeated use of Malus's law.)
If = 1 units

Explanation / Answer

according to malus law I=Iocos2 so after first plate I=11cos224=9.1802 after second plate I=9.1802cos241=5.2289 after third plate I=5.2289cos259=1.3870

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