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Snell's law
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Snell's law

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  • 1. Total Internal Reflection
  • 2. Total Internal Reflection
    • Occurs when light reflects off of the inside wall of a denser medium (higher index of refraction )
  • 3.
    • Recall:
    • When light passes from a dense material into a less dense medium, light reflects away from the normal
    Total Internal Reflection
  • 4.
    • As the angle of incidence increases , the angle of refraction increases
    Total Internal Reflection
  • 5. Critical Angle
    • At a certain angle, the refracted ray follows a path exactly along the surface of the dense medium
    • This angle is called the “ critical angle ”
  • 6. Critical Angle
    • If the incident ray is increased beyond the critical angle, the light is no longer refracted
    • Instead, it is reflected back inside the medium
    • This is called “ total internal reflection ”
  • 7.  
  • 8.  
  • 9.  
  • 10. Mirages
    • Formed by both Total Internal Reflection and Refraction
    • Produced when light passes through layers of air with different densities
  • 11. Mirage
  • 12. Snell’s Law
  • 13. Willebrord Snell
    • Dutch astronomer & mathematician
    • Identified the exact relationship between the angle of incidence and angle of reflection
  • 14. Snell’s Law
    • n 1 = index of refraction for medium 1
    • n 2 = index of refraction for medium 2
    •  1 = angle of incidence
    •  2 = angle of refraction
  • 15.  
  • 16.  

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