A light wave is linearly polarized in the z direction and the amplitude of the e

Question

A light wave is linearly polarized in the z direction and the amplitude of the electric field is -39o N/C. The wave is incident on a Polaroid whose axis of polarization makes an angle =[yy]"with the z axis, what is the magnitude of the amplitude of the electric field in the resulting 3. wave? Law of Malus In general, the intensity of a light wave is proportional to the square of the amplitude of the electric field: As seen above, when linearly polarized light goes through a Polaroid filter whose axis makes an angle be oloctric field changed by a factor of

Explanation / Answer

The electric field is polarized in z-axis and the polaroid is rotated by degree about z-axis. Then the amplitude of electric feild is given by

E = E0 Cos() = 390 Cos(45) = 195 2 N/C = 275.772 N/C

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