Reflections

• 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 energy stores
• What does it mean for a wave to be transmitted?

  The wave enters the material and continues traveling
• What leads to refraction when a wave is transmitted?

  The wave passes out the other side of the material
• 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 does the normal line represent 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?

  All incoming light rays are reflected in the same direction
• How does a rough surface affect reflection?

  It scatters light in different directions
• Why can't you see your reflection in paper?

  Paper has a rough surface causing diffuse reflection
• What is the relationship between angle of incidence and angle of reflection?

  They are always equal in both reflection types
• How do normals differ between smooth and rough surfaces?

  Normals on smooth surfaces are uniform; rough surfaces vary
• What is the outcome of light rays hitting a perfectly smooth surface?

  They reflect in the same direction
• What type of reflection gives a clear image?

  Specular reflection
• What happens to the normals on a rough surface?

  They point in different directions