In Figure ( a ) below, unpolarized light is sent into a system of two polarizing

Question

In Figure (a) below, unpolarized light is sent into a system of two polarizing sheets. The angles ?1 and ?2 of the polarizing directions of the sheets are measured counterclockwise from the positive direction of the y axis (they are not drawn to scale in the figure). Angle ?1 is fixed but angle ?2 can be varied. Figure (b) gives the intensity of the light emerging from sheet 2 as a function of ?2. (The scale of the intensity axis is not indicated.) What percentage of the light's initial intensity is transmitted by the two-sheet system when ?2 = 101o?

Explanation / Answer

so min intensity is at 170 degrees which means first polarier is at 170-90 = 80 degrees

so difference when theta2 = 101 is 101-80 =21

cos( 21 degrees)^2=0.872

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