REFRACTION

• Refraction is the change in direction of light when it passes from one medium to another of different optical density.
• Refraction occurs as a result of the change in the speed of light, as it crosses the boundary between two different medias.
• Optical Density is related to the transparency of a material to light.
• The higher the optical density, the slower the light travels through it.
• Stellar Scintillation - The twinkling of a star
• Refraction of light is alos responsible for the image formation in your eyes and lenses.
• Index of refraction - This indicated the optical density of a material
• Index of Reflection is also called reflective index.
• Index of Refraction - The ratio of the speed of light in a vaccum
• Formula for the index of refraction:

  
  

  • n = c/v
• The term n in the formula of index of refraction is the?

  Index of refraction
• The term c in the formula of index of refraction is the?

  Speed of light
• The term v in the formula of the index of refraction is the?

  Speed of light in the material
• The higher the Index of refraction, the higher the optical density.
• Snells Law - Named after dutch astronomer and mathematician Willebrord Snell.
• Snell's Law - Relates the indices of refraction of two media and the angles from the normal.
• Equation of the Snell's Law:

  n₁sinθ₁ = n₂sinθ₂
• In Snell's Law formula, the term θ₁ symbolizes?

  Angle of incidence
• In Snell's Law formula, the θ₂ symbolizes?

  Angle of Refraction
• In Snell's Law formula, the term n₂ symbolizes?

  Index of Refraction
• In the Snell's Law formula, the term n₁ symbolizes?

  The speed of light in the material
• When a ray of light passes from a denser medium to a less dense medium, is it refracted away or toward the normal?

  Away
• When a ray of light passes from a less dense medium to a denser medium, is it refracted toward or away from the normal?

  Toward
• Snells Law is named after dutch astronomer and mathematician Willebrord Snell.