A polarized light that has an intensity I0 = 60.0 W/m² is incident on three polarizing disks whose planes are parallel and centered on a common axis. Suppose that the transmission axis of the first polarizer is rotated 20° relative to the axis of polarization of the incident light, and that the transmission axis of each additional analyzer is rotated 20° relative to the transmission axis of the previous one. Calculate the transmitted intensity through all polarizers.

The transmitted intensity through all polarizers is

Explanation:

 According to Malu's law the intensity of a polarized light having an initial intensity is mathematically represented as

Now  considering the polarizer(The polarizing disk) the equation above becomes

Where n is the number of polarizers

       Substituting   for the initial intensity 3 for the n and 20° for the angle of rotation

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c. magnitude and direction