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P6.C Explaining Refraction
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P6.C Explaining Refraction

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  • 1. Explaining Refraction
  • 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. Explaining Refraction
  • 4. Explaining Refraction
  • 5. Explaining Refraction To understand refraction, we need to think of light as a wave travelling at 90 o to the light ray
  • 6. Explaining Refraction To understand refraction, we need to think of light as a wave travelling at 90 o to the light ray
  • 7. Explaining Refraction Imagine different points along that wave
  • 8. Explaining Refraction Imagine different points along that wave
  • 9. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  • 10. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  • 11. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  • 12. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  • 13. Explaining Refraction As light travels towards the Perspex block, the wave moves forward
  • 14. Explaining Refraction
    • As the light hits the Perspex block it slows down because Perspex is more dense than air
    • To light, the Perspex is like walking through treacle
    • The slower light does not travel as far in a given time
  • 15. Explaining Refraction
    • As the light hits the Perspex block it slows down because Perspex is more dense than air
    • To light, the Perspex is like walking through treacle
    • The slower light does not travel as far in a given time
  • 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. Explaining Refraction But the light that is this travelling through air is still moving quickly, so it travels further in a given time
  • 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. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 20. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 21. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 22. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 23. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 24. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 25. Explaining Refraction In the Perspex, all the light travels at the some speed
  • 26. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  • 27. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  • 28. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  • 29. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  • 30. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  • 31. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex
  • 32. Explaining Refraction As the light hits the air again it speeds up because air is less dense than Perspex