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Practice 4.3b – Polarization
Reagan IB Physics
There are two practice activities for unit 4.3 on Polarization. Complete both and attach solutions including work.
4.3b – Practice #1: Read Tsokos pages 271-274. Complete #1b, 2 – 7, 11, 12, 15, and 17
4.3b – Practice #2:
1.
This question is about polarization.
(a) A beam of unpolarized light of intensity I0 is incident on a polarizer. The polarization axis of
the polarizer is initially vertical as shown.
The polarizer is then rotated by 180° in the direction shown. On the axes below, sketch a graph
to show the variation with the rotation angle θ, of the transmitted light intensity I, as θ varies
from 0° to 180°. Label your sketch-graph with the letter U.
(2)
2.
This question is about polarizing filters and sources.
You are given two unlabelled light sources, one of which emits polarized light and the other does
not. You are also given two unlabelled transparent plastic sheets, one of which is a polarizer and the
other is not.
(a)
Describe how you would determine which one of the sources emits polarized light and which
sheet is a polarizing filter.
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(2)
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Practice 4.3b – Polarization
3.
Reagan IB Physics
This question is about polarization.
(a)
State what is meant by unpolarized light.
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(1)
(b)
A beam of unpolarized light of intensity 1.0 W m–2 is incident on an ideal polarizing filter.
State the value of the intensity of the transmitted light. Explain your answer.
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(2)
4.
This question is about polarization.
(a)
State what is meant by polarized light.
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(1)
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Practice 4.3b – Polarization
Reagan IB Physics
Solutions for Practice 4.3b #1: Tsokos 278 – 279 #1b, 2 – 7, 11, 12, 15, and 17 3/2
Practice 4.3b – Polarization
Reagan IB Physics
Solutions for Practice 4.3b #2: IB Questions Mark Scheme 1.
(a)
2.
3.
(a)
(a)
(b)
horizontal line; (labelled U)
through half the incident intensity;
2
hold the sheets one at a time up to each source and rotate them / OWTTE;
the sheet and source which give a variation in intensity upon rotation
are the polarizing/polarized ones / OWTTE;
2
all possible polarization directions are equally represented /
where the direction of polarization is random;
1
0.50 W m–2;
1
2
2
light in which the electric field is oscillating on only one plane;
1
(I ∝ cos2 θ) average value is
4.
(a)
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