reflection

• What is the main topic of today's video?

  The reflection of waves off a boundary
• What are the two types of reflection discussed in the video?

  Specular and diffuse reflection
• What happens when a wave arrives at a boundary between two materials?

  It can be absorbed, transmitted, or reflected
• What occurs when a wave is absorbed by a material?

  The energy from the wave is transferred to the material's energy stores
• What does it mean for a wave to be transmitted?

  The wave enters the material and continues traveling through it
• What is the relationship between the angle of incidence and the angle of reflection?

  The angle of incidence is always equal to the angle of reflection
• How do you start drawing a ray diagram for reflection?

  By drawing the boundary between the two materials
• What is the normal in a ray diagram?

  A dashed line that is perpendicular to the surface
• If the angle of incidence is $45^\circ$, what is the angle of reflection?


  $45^\circ$
• What is the point where the incoming ray touches the boundary called?

  The point of incidence
• What are the characteristics of specular reflection?

  • Occurs on smooth surfaces
  • All normals are in the same direction
  • Incoming light rays are reflected in the same direction
  • Produces a clear image
• What are the characteristics of diffuse reflection?

  • Occurs on rough surfaces
  • Normals point in different directions
  • Incoming light rays are reflected in various directions
  • Produces a scattered image
• Why can't you see your reflection in a piece of paper?

  Because it undergoes diffuse reflection
• How does the surface texture affect reflection?

  Smooth surfaces lead to specular reflection, while rough surfaces lead to diffuse reflection
• What is the significance of the angle of incidence in reflection?

  It determines the angle of reflection