p34_038 - I f = 1 2 I cos 2 (90 70 ) = 1 2 (43 W / m 2...

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38. In this case, we replace I 0 cos 2 70 by 1 2 I 0 as the intensity of the light after passing through the Frst polarizer. Therefore,
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Unformatted text preview: I f = 1 2 I cos 2 (90 70 ) = 1 2 (43 W / m 2 )(cos 2 20 ) = 19 W / m 2 ....
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