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Somewhere overthe RainbowIan AndersonPeggy Bertrand.. and team…
2 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat do we see?
3 Managed by UT-Battellefor the U.S. Department of Energy The Rainbow
4 Managed by UT-Battellefor the U.S. Department of Energy The RainbowThese are theobservationswe would liketo explain
5 Managed by UT-Battellefor the U.S. Department of Energy The RainbowThese are theobservationswe would liketo explainWe ne...
6 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater………?AirWater
7 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s play…..http://phet.colorado.edu/
8 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Reflec...
9 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Reflec...
10 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Refle...
11 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Refle...
12 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hits airfrom water…...
13 Managed by UT-Battellefor the U.S. Department of Energy The RainbowYour turn- measure the critical angle in asemicircul...
14 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s look at the results….
15 Managed by UT-Battellefor the U.S. Department of Energy The RainbowSome applications….
16 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
17 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular dr...
18 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular dr...
19 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular dr...
20 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
21 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
22 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular dr...
23 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
24 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
25 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
26 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s play…
27 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of...
29 Managed by UT-Battellefor the U.S. Department of Energy The RainbowYour turn…Ray of light from laserPrimary BowBottle o...
30 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat did you find?
31 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that l...
32 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that l...
33 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that l...
34 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that l...
35 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that l...
36 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat’s the answer?Angleofelevation(degrees)Distance ...
38 Managed by UT-Battellefor the U.S. Department of Energy The RainbowHave we explained everything?02040608010012014016018...
39 Managed by UT-Battellefor the U.S. Department of Energy The RainbowHave we explained everything?02040608010012014016018...
40 Managed by UT-Battellefor the U.S. Department of Energy The RainbowThe Supernumerary Arcs?If you want to know the expla...
41 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s make a rainbow….
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Ian Anderson - Somewhere Over the Rainbow

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Presented by Ian Anderson on March 23, 2013, as part of the Science Saturday series of lectures sponsored by Oak Ridge National Laboratory at ORAU.

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Ian Anderson - Somewhere Over the Rainbow

  1. 1. Somewhere overthe RainbowIan AndersonPeggy Bertrand.. and team…
  2. 2. 2 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat do we see?
  3. 3. 3 Managed by UT-Battellefor the U.S. Department of Energy The Rainbow
  4. 4. 4 Managed by UT-Battellefor the U.S. Department of Energy The RainbowThese are theobservationswe would liketo explain
  5. 5. 5 Managed by UT-Battellefor the U.S. Department of Energy The RainbowThese are theobservationswe would liketo explainWe need:1. White light – which is made up of many colors2. Rain – which is made up of drops of water
  6. 6. 6 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater………?AirWater
  7. 7. 7 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s play…..http://phet.colorado.edu/
  8. 8. 8 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Reflection and RefractionAirWaterIncident rayRefracted rayReflected ray
  9. 9. 9 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Reflection and RefractionAirWaterIncident ray (white)Refracted ray (split into colors)Reflected ray
  10. 10. 10 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Reflection and RefractionAirWaterIncident rayRefracted rayReflected rayiri
  11. 11. 11 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hitswater…….. Reflection and RefractionAirWaterIncident rayRefracted rayReflected rayiriiabsin (i) = a/b
  12. 12. 12 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when a ray of light hits airfrom water…….. Total Internal reflectionAirWaterIncident rayRefracted rayi = 90 degreesr = θcCritical Angleiabsin (i) = a/bsin θc = 1/n
  13. 13. 13 Managed by UT-Battellefor the U.S. Department of Energy The RainbowYour turn- measure the critical angle in asemicircular prismNormalPrismReflected beamLaser beamRefracted beamq
  14. 14. 14 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s look at the results….
  15. 15. 15 Managed by UT-Battellefor the U.S. Department of Energy The RainbowSome applications….
  16. 16. 16 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sunPrimary Bow
  17. 17. 17 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular drops of water?Ray of light from sunPrimary Bow
  18. 18. 18 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular drops of water?Ray of light from sunPrimary Bow
  19. 19. 19 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular drops of water?Ray of light from sunPrimary Bow
  20. 20. 20 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sunPrimary BowOne internal reflection
  21. 21. 21 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sunSecondary Bow
  22. 22. 22 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of whitelight hit circular drops of water?Ray of light from sunSecondary Bow
  23. 23. 23 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sunSecondary BowTwo internal reflections
  24. 24. 24 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sun Third Bow !!
  25. 25. 25 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sun Third Bow !!Three internal reflections!Guess which way the colors are 
  26. 26. 26 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s play…
  27. 27. 27 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat happens when rays of light hitcircular drops of water?Ray of light from sunPrimary Bow? How does this angle change?
  28. 28. 29 Managed by UT-Battellefor the U.S. Department of Energy The RainbowYour turn…Ray of light from laserPrimary BowBottle of waterdWhat is this angle?
  29. 29. 30 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat did you find?
  30. 30. 31 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that like a little trigonometry Ray of light from laserPrimary BowBottle of waterTotal Deviation D?What is this angled
  31. 31. 32 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that like a little trigonometry Ray of light from laserPrimary BowBottle of waterTotal Deviation D?What is this angledirD = (i-r)
  32. 32. 33 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that like a little trigonometry Ray of light from laserPrimary BowBottle of waterTotal Deviation D?What is this angledirD = (i-r) + (180-2r)rr
  33. 33. 34 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that like a little trigonometry Ray of light from laserPrimary BowBottle of waterTotal Deviation D?What is this angledirD = (i-r) + (180-2r) + (i-r)rrri
  34. 34. 35 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWe can calculate what we measured!- for those that like a little trigonometry Ray of light from laserPrimary BowBottle of waterTotal Deviation D ?What is this angledirD = (i-r) + (180-2r) + (i-r) = 2(i-r) + (180-2r)rrriD doesn’t depend on the size of the drop!!!!
  35. 35. 36 Managed by UT-Battellefor the U.S. Department of Energy The RainbowWhat’s the answer?Angleofelevation(degrees)Distance from the diameter of the bottled/RdRemember the Angles do not depend on the drop size!2R
  36. 36. 38 Managed by UT-Battellefor the U.S. Department of Energy The RainbowHave we explained everything?0204060801001201401601800 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Primary RedPrimary VioletSecondary RedSecondary VioletAngleofelevation(degrees)d/R
  37. 37. 39 Managed by UT-Battellefor the U.S. Department of Energy The RainbowHave we explained everything?0204060801001201401601800 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Primary RedPrimary VioletSecondary RedSecondary VioletAngleofelevation(degrees)Fraction of the radius of the drop (bottle)Alexander’s Dark Band
  38. 38. 40 Managed by UT-Battellefor the U.S. Department of Energy The RainbowThe Supernumerary Arcs?If you want to know the explanation – ask me afterwards 
  39. 39. 41 Managed by UT-Battellefor the U.S. Department of Energy The RainbowLet’s make a rainbow….

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