P6.C Explaining Refraction

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P6.C Explaining Refraction

  1. 1. Explaining Refraction
  2. 2. Explaining Refraction First we need a Perspex or glass block set at an angle The Perspex block is denser than air, but allow light to travel through it (i.e. it is transparent)
  3. 3. Explaining Refraction
  4. 4. Explaining Refraction
  5. 5. Explaining Refraction To understand refraction, we need to think of light as a wave travelling at 90 o to the light ray
  6. 6. Explaining Refraction To understand refraction, we need to think of light as a wave travelling at 90 o to the light ray
  7. 7. Explaining Refraction Imagine different points along that wave
  8. 8. Explaining Refraction Imagine different points along that wave
  9. 9. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  10. 10. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  11. 11. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  12. 12. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  13. 13. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  14. 14. Explaining Refraction <ul><li>As the light hits the Perspex block it slows down because Perspex is more dense than air </li></ul><ul><li>To light, the Perspex is like walking through treacle </li></ul><ul><li>The slower light does not travel as far in a given time </li></ul>
  15. 15. Explaining Refraction <ul><li>As the light hits the Perspex block it slows down because Perspex is more dense than air </li></ul><ul><li>To light, the Perspex is like walking through treacle </li></ul><ul><li>The slower light does not travel as far in a given time </li></ul>
  16. 16. Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
  17. 17. Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
  18. 18. Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
  19. 19. Explaining Refraction In the Perspex, all the light travels at the some speed
  20. 20. Explaining Refraction In the Perspex, all the light travels at the some speed
  21. 21. Explaining Refraction In the Perspex, all the light travels at the some speed
  22. 22. Explaining Refraction In the Perspex, all the light travels at the some speed
  23. 23. Explaining Refraction In the Perspex, all the light travels at the some speed
  24. 24. Explaining Refraction In the Perspex, all the light travels at the some speed
  25. 25. Explaining Refraction In the Perspex, all the light travels at the some speed
  26. 26. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  27. 27. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  28. 28. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  29. 29. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  30. 30. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  31. 31. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  32. 32. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex

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