Physics

• When object is infinitely away from lens:

  • Image distance = focal length
  • Image is real, inverted and diminished
  • Is used for object lens of a telescope
• When object > 2f of the lens:

  • Image is between f and 2f of lens
  • Object is inverted, real and diminished
  • Uses: Eye, Camera
• When object is at 2f:

  • Image is at 2f
  • Image is real, inverted and same size as object
• Object between f and 2f of lens:

  • Image is > 2f of lens
  • Image is real, inverted and magnified
• Object is at focal point of lens:

  • Image is at infinity and at the same side of lens
  • Image is virtual, upright and magnified
• Object is < f :

  • Image is behind object
  • Image is upright, virtual and magnified