Two polaroids are inclined at an angle of \(30^\circ\). Unpolarized light of intensity \(40\,W\,m^{-2}\) is incident on the first polaroid. Find the intensity after emerging from the second polaroid.
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Remember:
\[
I=\frac{I_0}{2}\cos^2\theta
\]
for unpolarized light passing through two polaroids.