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Polarization

Polarization. Patrick A. Kossmann. Have you taught polarization before? a) This is the first time I have heard of it. b) Its optional in our curriculum. c) I teach it all the time. Select the letter in your booklet that best matches your experience and show me. Assumed Preparation :

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Polarization

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  1. Polarization Patrick A. Kossmann

  2. Have you taught polarization before? a) This is the first time I have heard of it. b) Its optional in our curriculum. c) I teach it all the time. Select the letter in your booklet that best matches your experience and show me.

  3. Assumed Preparation: This worksheet assumes that the student is already familiar with classical polarized light and components of vectors. In particular, the students are already aware of the effect of crossed linear polarizers on light. This is reviewed in the first few questions.

  4. Put on a pair of glasses and close one eye. Look at your neighbour`s eyes. a) What do their glasses look like? b) What happens if you switch eyes? c) What happens if you tilt your head?

  5. Using a long spring, create a transverse wave that oscillates horizontally. What happens when you try to pass this between two people? How does this model what a polarizing filter does?

  6. Is this how polarizing filters work?

  7. Put on a pair of glasses and close one eye. • Have a pair of glasses in each hand. • Look at one of them and turn it until it looks black. • Place the other one between them and turn it. • What happens?

  8. Polarized light can be represented by vectors and the filters by a grid of lines. The diagram below shows a vertical filter that has let only vertically polarized light through. It is followed by a polarizer at +45o and another at 90o to vertical. Some of the light gets through the 45o filter. Draw components to help explain this. Draw components to explain how light gets through the last filter.

  9. 1000 unpolarized photons are directed at a polarizing filter. Through the filter you will get exactly 500 photons at least 500 photons around 500 photons

  10. A single unpolarized photon is directed at a polarizing filter. Through the filter you will get a photon half a photon a photon with half the energy a photon or no photon

  11. A photon passes through a filter at 0 and then heads toward another at another at 45o. Through the second filter you will get a photon Nothing 50 % chance of a photon 25 % chance of a photon

  12. A photon passes through a filter at 0 and then passes through another at another at 45o and then heads toward another at another which is also at 45o. Through the third filter you will get a photon Nothing 50 % chance of a photon 25 % chance of a photon

  13. The mathematics of polarized light is the same for the classical wave model as for the quantum model. How do these two models differ and which model is correct?

  14. Subversive Physics: Any physics course that has a unit on the wave nature of light should spend some time contrasting it with the particle and quantum models of light. Any course that has a unit on the wave nature of light should spend a lot of time on polarized light. Polarization is as surprising and easy to demonstrate as interference and diffraction. Its applications are growing rapidly from LCD screens to the new 3-D movie systems. Any course that includes quantum physics should spend time on polarized photons because they reinforce and extend the key concepts of wave-particle duality, measurement disturbance and intrinsic randomness.

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