Lenses

• What is a convex lens

  A lens that has an outward bulge causing them to refract parallel light from a certain point
• what is a concave lens


  a concave lens causes parallel light to be dispersed from the principle focus
• What is the principle focus

  Where the light converges of diverages
• what Is a concave lens

  concave lens cause paralell light to be disparues from the lens to the principle focus

  
• What does is a convex lens

  A lens’s that have an outward bulge cause them to refract parallel light into a single point

  
• What is the principle focus

  The line passing through the lens and is always on the axis
• What is the focal length

  The distance between the focal point and the centre of the lens
• How to improve the strength of a lense

  • decrease the focal length
  • make them mire curved
  • Use another material
• What is a real image

  Where light rays form together to form an image
• What is a virtual image

  Where light rays appear to form an image
• How to draw ray diagrams (concave/diverging lens

  Set up the axis

  Horizontal ray won’t change and goes straight on then bends up

  Vertical ray

  Find the difference between the focal point and then lens and draw image

  
• What comments should u add to ray diagrams that’s concave (diverging lens)

  Virtual Hits virtual right

  Upright

  Smaller than image
• How to draw convex lens

  The ray at the hitting the bottom of the lens won’t be refracted but the parallel ray is refracted so it hits the focal point of the other side

  
• What comments should u add to a ray diagrams that’s that’s converging(convex lens)

  inverted

  Smaller

  Real