reflection

• • waves can be reflected at boundary between two different materials
  • reflection of sound causes echoes
• law of reflection:

  • angle of incidence = angle of reflection
• • reflection can be specular or diffuse
• specular reflection:

  • reflection from a smooth and flat surface like a mirror
  • the image in a mirror is upright and virtual
• diffuse reflection:

  • reflection from a rough and diffuse surface
  • reflected light scattered in all direcions
  • because normal is different for each ray, angle of incidence is different for each ray
  • angle of incidence is still equal to angle of reflection
  • can cause distorted matte image or no image