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B2 Polarization of light (TG)
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| Words: 833 | Submitted: 15-May-2011
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DescriptionB2 Polarization of light (TG)
B2 Polarization of light
A. Polarization of light in Polaroid
1. View a lamp through a Polaroid. Describe how the intensity of the transmitted light changes compared with the light without the Polaroid.
The transmitted intensity becomes lower.
2. Rotate the Polaroid about an axis perpendicular to its plane. Describe how the intensity of the transmitted light changes.
The transmitted intensity remains unchanged.
4. Given that the intensity of the transmitted light is minimum when the polarizer and analyzer are crossed. At that moment, insert the third piece of Polaroid between them. Rotate the third Polaroid. Describe how the intensity of the transmitted light changes.
The transmitted intensity changes from minimum (zero) to maximum first, and then
returns to minimum (zero) as the third polaroid is rotated through 90o . The minimum
(zero) intensity happens when the third polaroid is parallel to either the polarizer or the
B. Polarized light by reflection
6. Can you conclude that the reflected light is unpolarized, completely polarized or partially polarized?
The reflected light is partially polarized.
C. Polarized light by scattering
8. Use a Polaroid to view the scattering light in positions A and B, and the transmitted light in position C. Describe the polarization of light in different positions with the aid of a diagram.
Scattering light in the directions A and B are partially polarized while that in the direction
D. Optical activity of sugar solution
11. Place a tank of sugar solution in between the two Polaroids. Describe how the intensity of the transmitted light changes.
The transmitted intensity becomes lower. When one of the polaroids and analyzer is
rotated at a small angle starting from the two polaroids parallel to each other, the intensity
of the transmitted light becomes maximum.
12. Rotate the analyzer at an angle such that the intensity of the transmitted light is maximum. Measure the angle using a protractor.
Approximate angle rotated = ___Several degrees_______________
Note: The angle rotated depends on the sugar concentration and the wavelength of the incoming light.
E. Liquid crystal display (LCD)
14. Rotate the Polaroid. Describe what you observe.
The LCD goes dark in one position of the polaroid when the polaroid is crossed with the
polarizing film on the top surface of the LCD.
Results and Discussion
From step 4, briefly explain why the intensity of the transmitted light changes after inserting the third piece of Polaroid between two Polaroids.
When the two polaroids are crossed, the transmitted light through the first polaroid is
linearly polarized for which its only component is blocked when passed through the
second polaroid, and no transmitted light therefore can be observed. If the third polaroid
is inserted and rotated to an angle such that the transmission direction is not the same as
that of the other two, the transmitted light can be observed with a certain intensity.
Describe the polarization of light by reflection ...
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