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Polarizers 1 and 3 have their axes of polarization, indicated by the black solid lines, perpendicular to each other. If you try to shine light through only the combination of 1 and 3, you will find that none passes through. However, now we put in another polarizer (number 2 in the figure) between number 1 and number 3. This polarizer has an axes of polarization that has an angle of θ = 25° with respect to the polarization axes of polarizer 1. Surprisingly, now some light passes through the combination 1+2+3. What percentage of the initial (unpolarized) light intensity passes through?

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Added Sat, 06 Aug '16
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$$I = 1/2*I_0$$

$$I=I_0*cos^2(ϑ)$$

Start : I = 100%

Pol_1 : I = 1/2*I_0 = 50%

Pol_2 : I = 50%*cos^2(25) = 50% * 0.82139 = 41.06%

Pol_3 : I = 41.06% * cos^2(90-25) = 41.06* 0.1786 = 7.33%

Edit
Edited Mon, 08 Aug '16
Added Sat, 06 Aug '16
thanks again! sinking Sat, 06 Aug '16
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