Reflection & refraction

• When a wave hits a material what happens?

  Reflects

  Transmits

  Absorbs
• Law of reflection


  Angle of incidence = angle of reflection
• Two types of reflection

  Specular

  Diffuse
• Specular reflection


  Occurs on surfaces where boundary is flat

  Creates a clear imagine, like a mirror
• Diffuse reflection


  Occurs on uneven surfaces

  Creates an unclear image or no image at all, like a piece of paper
• Incident ray


  Incoming ray
• Refraction


  Change in direction of a wave from one medium to another

  Caused by waves change in speed, as the density of the medium changes
• Does light travel faster or slower in a more dense medium


  More slowly
• When light travels from a less dense medium to a more dense medium will it bend towards or away the normal?


  Towards
• What happens to the frequency of light as it passes into a more dense medium

  It stays the same

  Density of medium only affects wavelength and speed
• What happens to wavelength of light as it passes into more dense medium

  Wavelength will decrease