
49-6 Optical
S =
I
1
2 2
2 2
2
cos cos
cos sin
sin
ε φ
ε φ
ε
(4
9
.7)
I
n
Eq
uations
49.6 an
d
49.7, th
e
am
plitude
a an
d
in
tensity
I ar
e
to
tally
sep
arated
fr
om
th
e
an
gles
ϕ an
d
ε
th
at
de
termine
th
e
po
larization
st
ate
.
e de
grees
of li
near
an
d
ci
rcular
po
larization
ar
e
co
s2ε
an
d
si
n2ε,
co
rrespondingly
. St
okes
pa
rameters
fo
r
pe
rfectly
po
larized
li
ght
gi
ven
in Eq
uation
49.7 sa
tisfy
th
e
id
entity
S S S S
0
2
1
2
2
2
3
2
= + +
(4
9
.8)
49.3 Polarization of Light
Light is composed of an ensemble of EM waves. A single EM wave has a certain electric eld direc-
tion
an
d
ph
ase
. Un
polarized
li
ght
ca
n
be vi
sualized
as an en
semble
of EM wa
ves
wi
th
ra
ndom
e
ld
di
rec ...