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Polarization

Polarization. Polarization. In chemistry, we refer to polarization as the separation of + and – charges. With light, we are referring to the separation of electromagnetic waves whose electric fields are moving at several different angles. Net electric field is zero – Un-polarized light!.

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Polarization

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  1. Polarization

  2. Polarization • In chemistry, we refer to polarization as the separation of + and – charges. • With light, we are referring to the separation of electromagnetic waves whose electric fields are moving at several different angles. Net electric field is zero – Un-polarized light! Electric field is moving in one direction – Polarized light!

  3. Polarization When an electric field is only oscillating up and down or only left and right, it islinearly polarized.

  4. Polarization • How do we make Polarized Light? 1. Transmission 2. Scattering

  5. Transmission 1. Utilizes “polarizers” to select for a specific electric field orientation. Polarizers= long chained molecules which absorb light with electric fields perpendicular to the axis of transmission.

  6. Transmission • Multiple polarizing substances can be used to determined how linearly polarized light actually is. • The greater the angle between the electric field waves and the transmission axis, the less amount of light will pass through the second polarizer.

  7. Transmission • When the transmission axis (second polarizer) becomes perpendicular to the plane of the polarized light, no light will pass through.

  8. Scattering • Occurs when un-polarized light: a. comes into contact with a molecule of atmospheric gas b. comes into contact with a reflective material

  9. Scattering

  10. Scattering This is how we get a glare from roads, bodies of water, and car hoods. - Polarizing sun glasses whose axis of transmission is perpendicular to the reflected ray will cancel out the reflecting light.

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