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Unformatted text preview: 36. As the unpolarized beam of intensity I0 passes the ﬁrst polarizer, its intensity is reduced to 1 I0 . After
passing through the second polarizer, for which the direction of polarization is at an angle θ from that
of the ﬁrst one, the intensity is I = 1 I0 cos2 θ = 1 I0 . Thus, cos2 θ = 2/3, which leads to θ = 35◦ .
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