Wave Optics
327
24.52
2
0
cos
II
θ
=
⇒
1
0
cos
I
I
−
=
(a)
0
1
3.00
I
I
=
⇒
1
1
cos
54.7
3.00
−
==
°
(b)
0
1
5.00
I
I
=
⇒
1
1
cos
63.4
5.00
−
°
(c)
0
1
10.0
I
I
=
⇒
1
1
cos
71.6
10.0
−
°
1
24.53
From Malus’s law, the intensity of the light transmitted by the first polarizer is
2
1
cos
i
=
. The plane of polarization of this light is parallel to the axis of the first plate
and is incident on the second plate. Malus’s law gives the intensity transmitted by the
second plate as
()
( )
22
2
21
1
cos
cos
cos
i
I
θθ
=−
=
−
. This light is polarized parallel
to the axis of the second plate and is incident upon the third plate. A final application of
Malus’s law gives the transmitted intensity as
( ) ( )
2
3
co
2
23
2
12
1
s
cos
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 Spring '09
 Physics, Work, Light, Polarization, Cos, θ

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