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(a). Brewster’s angle is a particular angle of incidence at which the incoming unpolarized
wave made up of two incoherent orthogonal states, only the component polarized normal
to the incident plane and therefore parallel to the surface will be reflected.
3 points
(b). under Brewster’s angle, using the given Fresnel equation and Snell’s law,
n
n
n
n
n
n
n
n
n
r
p
p
p
p
p
p
p
p
p
p
p
p
p
p
p
1
2
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
tan
cos
sin
cos
2
)
sin
2
1
(
1
cos
2
sin
4
cos
4
1
1
sin
cos
sin
cos
sin
cos
0
)
(

=
⇒
=
⇒

±
=
+

±
=
⇒

=
⇒

+


=
=
θ
In this problem
o
7
.
56
,
52
.
1
n
.
7 points
Problem 2
(a). since the electric and magnetic fields cannot be discontinuous at a boundary, in total
internal reflection, there is a wave whose amplitude drops off exponentially as it
penetrates the less dense medium. The disturbance advances in the xdirection as a
surface. This wave is evanescent wave.
3 points
(b).
7 points
ELEC308 (Spring 2008)
Quiz 2
TA solution
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 Spring '11
 Prof.ShenghuiSong

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