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Polarization of Light

Polarization of Light. Presented by Beili Wang SC 442 Honors class 2001, Dr. Roman Kezerashvili. Objective. Study the polarization of light Study two phenomena of light: Absorption Reflection Verify Brewster’s law and Malus’s law. Theory. Two properties of light

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Polarization of Light

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  1. Polarizationof Light Presented by Beili Wang SC 442 Honors class 2001, Dr. Roman Kezerashvili

  2. Objective • Study the polarization of light • Study two phenomena of light: • Absorption • Reflection • Verify Brewster’s law and Malus’s law

  3. Theory • Two properties of light a. The wave theory of light The light is a transverse electromagnetic wave with the vibrating electric and magnetic fields, which are perpendicular to each other and to the direction of propagation of light. b. Polarization Polarization is a property of transverse wave related to the directions in which vibration occur.

  4. Part I. Polarization y (a) (c) y x y z (b) x z z x • Transverse wave on the string polarized in the y-direction • Transverse wave polarized in the z-direction. • The vertical slit passes component polarized in the y-direction and blocks those in the z-direction acting as a Polaroid.

  5. Polarizer Axis of Polarizer The light passes through a polarizer that has the effect of polarization. Incident unploarized light Polarizer Linearly polarized light

  6. Analysis for Part I When light is sent through the polarizers, electric field components parallel to the polarizing direction is transmitted; while components perpendicular to the polarizing direction are absorbed by the polarizers and disappear. Holders with polarizer and analyzer Crossed Arrow Target holder 180 Light source 0

  7. Part II. Absorption Malus’s law Axis of Polarizer Direction of axis of Polarizer on the left Polarizer Analyzer θ Axis of Analyzer

  8. Data from Part II Intensity of the light when both polarizer and analyzer are removed: i = 10 w/m^2 Intensity of the light when it passes just through the polarizer: i1 = 4 w/m^2 Intensity of the light when it passes through the polarizer and analyzer: i2 = 2.5 w/m^2 Ratio of intensities: i1/i = 0.4 Ratio of intensities: i2/i = 0.25 Ratio of intensities: i1/i2 =1.6

  9. Table 1 for Part II

  10. Graph for Part II

  11. Part III. Reflection Unpolarized Incident ray Polarized Reflected ray Normal line θB θB Medium 1 90 degree Medium 2 Slightly polarized Refracted ray θ2

  12. Table 2 for Part III

  13. Conclusion In this experiment, we study the polarization of light by observing the reflection of the light and the absorption of the light. Furthermore, we verify Brewer’s law and Malus’s law for polarized light.

  14. Questionsor Comments Thank You The End

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