EBK PHYSICS
5th Edition
ISBN: 8220103026918
Author: Walker
Publisher: PEARSON
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Textbook Question
Chapter 25, Problem 76PCE
Predict/Calculate A beam of vertically polarized light encounters two polarizing filters, as shown in Figure 25-45. (a) Rank the three cases A B and C, in order of increasing transmitted intensity Indicate ties where appropriate (b) Calculate the transmitted intensity for each of the cases in Figure 25-45, assuming that the incident intensity is 55.5 W/m2 verify that your numerical results agree with the rankings in part (a).
Figure 25-45
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Unpolarized light passes through two ideal polarizers in turn with polarization axes at 31.5° to each other. What is the fraction of the incident light intensity that is transmitted?
Numeric Response
Unpolarized light, of intensity Io is incident on a pair of polarizers as shown below. The trans-
mission axis of the first polarizer is vertical. The transmission axis of the second polarizer is unknown.
Unpolarized
light,
intensity lo
X
Observer
Polarizers
(a) What should be the orientation of the second polarizer such that no light reaches the observer. If
this is not possible, say so explicitly.
(b) What should be the orientation of the second polarizer such that light of intensity Io/2 reaches the
observer. If this is not possible, say so explicitly.
Light of intensity I, is incident on a polarizer. The transmission axis of the polarizer is vertical. The
polarizer is rotated by an angle 0 about the direction of the incident light.
polarizer
transmitted light
incident light
transmission axis
The intensity of the transmitted light is measured for various angles 0 .
(b) On the axes below, sketch graphs to show the variation of the transmitted intensity I
with 0
(i) if the incident light is horizontally polarized.
() if the incident light is unpolarizéd.
1-
intensity
0°
90°
180°
Chapter 25 Solutions
EBK PHYSICS
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