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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