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Unformatted text preview: 94. We apply Eq. 3340 (once) and Eq. 3342 (twice) to obtain
I= 1
I 0 cos 2 θ1' cos 2 θ 2'
2 where θ1' = (90° − θ1 ) + θ 2 = 110° is the relative angle between the first and the second
polarizing sheets, and θ 2' = 90° − θ 2 = 50° is the relative angle between the second and the
third polarizing sheets. Thus, we have I/I0 = 0.024. ...
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 Spring '08
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