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direction of the previous sheet. The transmitted radiation is polarized, with its direction of
polarization making an angle of 90° with the direction of polarization of the incident
radiation. The intensity is
2
0
cos (90 / )
n
I
In
=°
.
We want the smallest integer value of
n
for which this is greater than 0.60
I
0
. We start
with
n
= 2 and calculate
2
cos (90 / )
n
n
°
. If the result is greater than 0.60, we have obtained
the solution. If it is less, increase
n
by 1 and try again. We repeat this process, increasing
n
by 1 each time, until we have a value for which
2
cos (90 / )
n
n
°
is greater than 0.60. The
first one will be
n
= 5.
43. (a) The rotation cannot be done with a single sheet. If a sheet is placed with its
polarizing direction at an angle of 90° to the direction of polarization of the incident
radiation, no radiation is transmitted. It can be done with two sheets. We place the first
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 Spring '08
 Any
 Physics, Polarization, Radiation

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