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Aim: How can we explain polarization and dispersion?

Aim: How can we explain polarization and dispersion?. Do Now: Why do athletes wear polarized sunglasses?. Incoherent Light. When light waves emitted by a source have no special phase relationship, the light beam spreads and loses intensity quickly. Coherent Light.

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Aim: How can we explain polarization and dispersion?

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  1. Aim: How can we explain polarization and dispersion? Do Now: Why do athletes wear polarized sunglasses?

  2. Incoherent Light • When light waves emitted by a source have no special phase relationship, the light beam spreads and loses intensity quickly

  3. Coherent Light • Monochromatic light with most waves in phase, spreads very little and is intense • A laser!!

  4. Light coming from the sun or a light bulb emit light waves that are vibrating in every plane • We call this type of light unpolarized

  5. Polarized Light • A beam of light that only vibrates in one direction

  6. So what happens if we add a 2nd polarizing filter oriented 90° to the 1st? Demo

  7. What’s Happening?

  8. Only transverse waves (like light) can be polarized • Can sound waves be polarized? NO!!!

  9. Dispersion • When polychromatic (white) light is passed through a prism, it is separated into its component colors

  10. What is Polychromatic Light?

  11. red • Which light bends the least? • Which light bends the most? violet

  12. Why? Speed of light inside prism depends on the wavelength of light v = fλ (f is const!!) λred= highest vred = highest Red has the lowest index of refraction, therefore bends the least Violet therefore bends the most

  13. Dispersive Mediums • Prisms • Air (rainbows) • Glass Thin films of: • Water • Bubbles • Oil • Gas • People?

  14. Prism Spectrometer • Disperses light into component colors • Allows you to determine the elements the stars are made out of when attached to a telescope

  15. Gas Tubes

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