Posted by opp on Monday, November 5, 2012 at 3:57pm.
If polarized light of intensity I₀ is incident on a polarizing sheet, the intensity transmitted by
the sheet depends on the angle between the polarization direction of the light and the transmission axis of the sheet, φ, via
I= I₀•cos²φ.
After the 1st sheet
I₁=0.5•I₀.
After the 2nd sheet
I₂=I₁•cos²φ₁=0.5•I₀•cos²27°=0.397•I₀.
After the 2nd sheet
I₃=I₂•cos²φ₂=0.397•I₀•cos²(50-27)°=0.336•I₀.
After the 3rd sheet
I₄=I₃•cos²φ₃=0.336•I₀•cos²(90-50)°=0.197•I₀.
(I₄/I₀)•100%= 19.7%
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