Unpolarized light is incident on a system of three polarizers. Thesecond polariz

Question

Unpolarized light is incident on a system of three polarizers. Thesecond polarizer is oriented at an angle of 30.0° with respectto the first and the third is oriented at an angle of 45.0°with respect to the first. If the light that emfrom the system hasan intensity of 23.0 W/m2, what is the intensity of the incidentlight?
b. Unpolarized light of intensity I0 is sent through 4 polarizers,each of the last three rotated 30° from the previous polarizerso that the last polarizer is perpendicular to the first. What isthe intensity transmitted by this system?

Explanation / Answer

Let the intensityof the unpolarised light be I

Then intensity of the light after 1 st sheet I ‘ = I/ 2

Intensity of the light after 2 nd sheet I “ = I‘ cos 2 30

                                                                 = 0.375 I

Intensity after 3 rd sheet I “’ = I“ cos 2 ( 45-30 )

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