Refraction of Light

• Refraction - The change in the direction of light when it passes from one medium to another in different optical density
• n = Index of Refraction - indicates the optical density of material 
• c = Speed of Light
• v = Speed of Light in a Substance
• Ray is refracted away from normal if the ray passes from a denser to less dense medium
• Ray is refracted towards the normal if the ray passes from less dense to denser medium
• When ray is perpendicular to normal, no bending of light will occur
• What are the two types of lenses?

  Concave and Convex
• Concave - Thicker at the edges that at the middle (Scattered)
• Convex - Thicker at the middle that at the edges (Not Scattered)
• A ray parallel to the principal axis will pass through the principal focus
• A ray passing through the secondary focus is refracted parallel to the principal axis
• A ray passing through the optical center is not deviated