Reflections

• What is the focus of today's video?

  Reflection of waves off a boundary
• What are the two types of reflection discussed?

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

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

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

  The wave enters the material and continues traveling
• What is the relationship between wavelength and reflection?

  The wavelength affects how waves interact with materials
• What is the rule for drawing ray diagrams regarding angles?

  The angle of incidence equals the angle of reflection
• How do you start drawing a ray diagram?

  Begin with the boundary between two materials
• What is the normal in a ray diagram?

  A dashed line perpendicular to the surface
• How do you measure the angle of incidence?

  Measure the angle between the incoming ray and the normal
• What is the point where the incoming ray touches the boundary called?

  Point of incidence
• What characterizes specular reflection?

  It occurs on smooth surfaces like mirrors
• Why can't you see your reflection in paper?

  Paper has a rough surface causing diffuse reflection
• How does diffuse reflection differ from specular reflection?

  Diffuse reflection scatters light in different directions
• What happens to the normals on a rough surface?

  Normals point in different directions
• What is the key takeaway about angles in reflection?

  Angle of incidence equals angle of reflection
• What is the significance of the dashed line in ray diagrams?

  It represents the normal to the surface
• How do the properties of materials affect wave behavior at boundaries?

  They determine whether waves are absorbed, transmitted, or reflected