refraction and reflction

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refraction and reflction

  1. 1. Reflection Review
  2. 2. NORMAL LINE PERPENDICULA R
  3. 3. INCIDENCE INCIDENT 40 ͦ REFLECTIO N REFLECTED
  4. 4. Slide 4 Law of Reflection i r
  5. 5. Refraction The change in direction of a wave as it crosses the boundary between two media in which the wave travels at different speeds.
  6. 6. Index of Refraction materialinlightofspeed vacuuminlightofspeed n
  7. 7. Index of Refraction Material Index of Refraction Vacuum 1.0000 Air 1.0003 Ice 1.3100 Water 1.3330 Ethyl Alcohol 1.3600 Plexiglas 1.5100 Crown Glass 1.5200 Light Flint Glass 1.5800 Dense Flint Glass 1.6600 Zircon 1.9230 Diamond 2.4170 Rutile 2.9070 Gallium phosphide 3.5000
  8. 8. Index of refraction of air Speed of light In vacuum 299, 792 km/s In air 299,705 km/s n= 299, 792 km/s / 299, 705 =1.0003
  9. 9. Index of refraction of water Speed of light In vacuum 299, 792 km/s In water 224, 900 km/s n= 299, 792 km/s / 224, 900 =1.3330
  10. 10. Snell’s Law 2211 sinsin nn
  11. 11. Example Light travels from air into an optical fiber with an index of refraction of 1.44. (a) If the angle of incidence on the end of the fiber is 22o, what is the angle of refraction inside the fiber? n1 = 1.00 n2 = 1.44 θ1 = 22o (1.00) sin 22o = 1.44 sin θ2. (1.00/1.44) sin 22o = sin θ2 0.260 = sin θ2 sin-1 (0.260) = θ2 15o= θ2 2211 sinsin nn
  12. 12. Worksheet Label the following diagram Angle of Incidence Incident Ray Normal Line Refracted Ray Angle of Refraction
  13. 13. n= 299, 792 km/s / 169, 500 km/s =1.76 Substance Speed of Light in Substance Refractive Index Sapphire 169,500 km/s 1.76
  14. 14. 1.36 sin45 o = 2.42 sin θ2. (1.36/2.42) sin 45o = sin θ2 0.40 = sin θ2 sin-1 (0.40) = θ2 23.58o= θ2 45 ͦ 24 ͦ
  15. 15. Water: 1.00 sin40 o = 1.33 sin θ2. (1.00/1.33) sin 40o = sin θ2 0.40 = sin θ2 sin-1 (0.40) = θ2 28.90o= θ2 Perspex: 1.00 sin40 o = 1.5 sin θ2. (1.00/1.5) sin 40o = sin θ2 0.40 = sin θ2 sin-1 (0.40) = θ2 25.37o= θ2 Angle of Incidence (in air) Angle of refraction in water (nwater = 1.33) Angle of refraction in perspex (nperspex = 1.5) 40 ͦ 28.90 25.37
  16. 16. Which arrow point the real position of the fish and which arrow point the position of the fish’ image (from the man’s position?)

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