REFRACTION AND LENSES

• Refraction is the bending of light waves as they enter or cross the boundary between two media with different densities.
• The angle at which this ray is bent from the normal line is the angle of refraction.
• The law of refraction was first observed by Willebrord Snellius (Snell) as he described the relationship of the angle of incidence to the angle of refraction.
• Snell's Law Formula:

  $n=$$c/v$
• Refractive Indexes of different media:

  A) Vacuum

  B) Air

  C) 1.003

  D) water

  E) 1.36

  F) 1.47

  G) 1.52

  H) Quartz

  I) 1.61

  J) Diamond

  
• High index of reflection = slow
• low index of reflection = high