Grade 10 Optics

• Virtual Image


  Only be seen using mirror and cant be projected
• Real Image


  Seen on surfaces and can be projected
• Law of reflection

  States that the angle of incidence is equal to the angle of reflection
• Plane mirrors


  Are regular flat mirrors.
• What are some examples of a plane mirror

  rear-view mirror and makeup mirrors
• Concave mirrors


  Also called converging mirrors
• What is an example of a concave mirror?

  Microscope and flashlights
• Convex Mirrors


  Also called diverging mirrors
• What are some examples of convex mirrors?

  store security mirrors and side mirrors
• Dispersion


  The process in which light is scattered or spread out
• Concave lens


  Also called diverging lens
• What is an example of a diverging lens

  flashlights and binoculars
• Convex lens


  Also called converging lens
• What are some examples of converging lenses

  Telescope and magnifying glass
• Critical angle


  The angle of incidence which produces a refracted angle of 90 degrees
• total internal reflection


  Happens if the angle of incidence is greater than the critical angle
• What natural phenomenon forms from T.I.R

  Mirage
• An example of when T.I.R would occur

  A mirage
• Incandescence


  Emission of light by an object that has been heated
• What is an example of a Incandescence light

  Incandescent Light Bulb
• Fluorescence 


  Emit visible light when hit by invisible high energy particles
• What is an example of fluorescence light

  fluorescent lamp
• Phosphorescence


  store light energy then release it later
• what is an example of Phosphorescence light

  glow in the dark toys
• Chemiluminescence 


  Produce and emit light after a chemical reaction
• Bioluminescent 


  produce light through chemical reactions taking place inside certain creatures
• What is an example of Chemiluminescence light

  Glow stick
• what is an example of bioluminescent light

  Fireflies
• Triboluminescence


  Produce light by scratching, rubbing, and crashing a substance
• What is an example of Triboluminescence light

  Wint-O-green lifesavers
• Electrical discharge


  producing light by passing an electric current through a gas
• What is an example of electrical discharge

  Lightning
• LED


  Production of light from electronic devices
• What is an example of LED

  LED bulb
• Frequency


  the number of waves that pass a fixed point in unit time
• Radiowaves


  used for communication and can travel far
• Example of radiowaves


  radar and rdio
• microwaves


  Used for cooking
• example of microwaves

  microwave oven and telecommunications
• infrared waves


  light given off by all objects above 0 degrees kelvin