81. We apply Eq. 3440 (once) and Eq. 3442 (twice) to obtain
I
=
1
2
I
0
cos
2
θ
1
cos
2
θ
2
.
With
θ
1
=60
◦
−
20
◦
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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