Homework Answers
apply snell's law on first surface
1 *sin 43 = n *sin ( phi)
apply snell's law on 2nd surface
n *sin ( 90 - phi) = sin 81
n *cos ( phi) = sin 81
divide both
tan ( phi ) = sin ( 43) /sin ( 81)
solve for phi
we got
phi = 34.625 degree
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