Lenses and Imaging

• Concave lenses cave inwards, and cause parallel rays of light to diverge (spread out).

  
• Convex lenses are shaped like ovals, and causes parallel rays of light to converge (move together)

  
• There are 2 types of images:

  • Real image - where light from an object comes together to form an image on a 'screen'
  • Virtual image - when the rays are diverging, so the light appears to have come from an initial point

  
• Ray diagram: Concave lens

  • produces a virtual image

  
• Ray diagram: Convex lens

  • produces a real image