topic 1

• 4 Properties of Light:

  • Light travels in straight lines
  • Light can reflect
  • Light can refract (bend)
  • Light is a form of energy 
• Optical Device: any device that uses light 

  ex. Mirrors, Lenses, microscopes, telescopes
• microscope -

  • Optical device used for viewing very small objects 
  • Has at least 2 lenses 
  • Objective lens
  • Eyepiece lens 
  • When light shines through a very thin specimen, a large image is produced that you can see by looking through the eyepiece
• telescope - a device that uses lenses to magnify distant objects, enabling them to be observed more clearly

  • Telescopes provide enlarged images of distant objects by using lenses and mirrors, or a combination of both to collect light from distant objects and bring it to your eyes
  • 2 Types:
  • Reflecting
  • Refracting
• reflecting telescope -

  • Uses mirrors and a lens to form an enlarged image
  •  One of the mirrors is a large circular mirror that curves inward which gathers light very well
• refraction telescope -

  • Uses 2 lenses to form an enlarged image
  •  The larger lens is the objective lens that gathers light and focuses rays towards the eyepiece
• binoculars -

  • Device for viewing distant objects
  • Made up of 2 short refracting telescopes fitted together 
  • Have reflective prisms inside
• convex- curved outwards ()

  concave - curved inwards )(