Lenses

• 2 types of lenses:

  • Convex
  • Concave
• What lense is this?

  A) Concave lens

  
• What lense is this?

  A) Convex lens

  
• How do concave lenses help with myopia?

  Diverge light to help focus light back onto the retina
• How do convex lenses help hyperopia?

  Converge light onto the retina to help focus on a far object
• What do convex lenses help correct?

  Hyperopia (farsightedness)
• What do concave lenses help correct?

  Myopia (shortsightedness)
• Magnification = Image Size ÷ Actual Size
• Virtual Image: Where imagery rays intersect
• Label the diagram:

  A) Principal Focus

  B) Principal Focus

  C) Focal Length