Reflection

• What is the main topic of the video discussed in the study material?

  The reflection of waves off a boundary
• What are the two types of reflection mentioned in the study material?

  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 wavelength of a wave and the properties of the materials at a boundary?


  The wavelength and material properties determine whether the wave is absorbed, transmitted, or reflected
• What is the rule for drawing ray diagrams regarding angles?


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


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

  The normal is a vertical imaginary line that is perpendicular to the boundary
• How do you measure the angle of incidence in a ray diagram?


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

  The point of incidence
• What characterizes specular reflection?


  It occurs on smooth surfaces where all normals are in the same direction
• What is the result of diffuse reflection?


  Light is reflected in many different directions
• Why can't you see your reflection in a piece of paper?


  Because paper has a rough surface causing diffuse reflection
• How do the normals behave on a rough surface?


  The normals point in different directions due to the surface's bumps
• What is the significance of the angle of incidence in both specular and diffuse reflection?


  The angle of incidence is always equal to the angle of reflection
• What are the three possible outcomes when a wave arrives at a boundary between two materials?

  • Absorption: Energy is transferred to the material
  • Transmission: Wave enters and continues traveling
  • Reflection: Wave is reflected off the surface
• What are the differences between specular and diffuse reflection?

  Specular Reflection:

  • Occurs on smooth surfaces
  • Produces clear images
  • Normals are aligned

  
  

  Diffuse Reflection:

  • Occurs on rough surfaces
  • Scatters light in different directions
  • Normals point in various directions
• How can reflection of light be shown

  Reflection of light can be shown when light reflects at a plane mirror and forms an image. This is called virtual image

  
• What happens when light is reflected off a boundary?

  It is reflected (bounces) off a smooth flat surface so that the angle of incidence (the angle it comes in at) is the same as

  the angle of reflection (the angle it leaves at).