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Optics and Refraction

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blanca
14 diapositives · 975 Views · Jul 29, 2014

Optics and Refraction. Dispersion, Rainbows, Mirages, Polarization. Dispersion. Different frequencies actually have different indices of refraction, moving through the medium at different speeds Red light bends least; violet most

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Optics and Refraction
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  1. Optics and Refraction Dispersion, Rainbows, Mirages, Polarization

  2. Dispersion • Different frequencies actually have different indices of refraction, moving through the medium at different speeds • Red light bends least; violet most • White light refracting through a prism will split into its component colors

  3. Rainbows • The rainbow is caused by a whole set of circular prisms (raindrops) illuminated from behind • It is a characteristic phenomenon of total internal reflection occurring in many raindrops at once

  4. Total Internal Reflection • Light that passes through the raindrop continues on, invisible to our eyes • Light that undergoes T.I.R. is reflected back to us • Dispersion—the difference in speed between colors of light—and Snell’s Law cause the red light to emerge from the sphere at a 42° angle from the original light • Similarly, violet emerges at 40 °angle

  5. The Result of T.I.R.… • The observer sees red light from the upper drops (42°) and violet light from the lower drops (40°) • Between 42° and 40°, the other colors appear • At angles less than 40°, where T.I.R. is not visible, the colors mix about equally

  6. Causing a Lovely Rainbow… …illuminated within by all the light that did not undergo one round of total internal reflection. See how the rainbow’s interior is always brighter than the surrounding sky? What is causing the secondary bow, do you think?

  7. Another Round of T.I.R.!

  8. Did you Know that rainbows are actually circular? …so why do they look like bows?

  9. And the same effect can be caused with ice crystals? It’s called “pilot’s glory” or “Buddha’s light,” and is seen by pilots in clouds.

  10. Mirages: Another effect of refraction • From your standpoint, you can see puddles of “water” on the ground • When you arrive at the location, no water is present! • Why not?

  11. Light Appears to Emanate from the Ground… …causing an image to appear at ground level where no image truly exists.

  12. A tree on the ground??? Can't be! …it must be a puddle of water reflecting the tree’s image, right? Right?

  13. Polarization

  14. Uses of Polarization Glare-reducing sunglasses LCD