Reflection

• 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, often leading to refraction.
• What is the focus of the video?

  The focus is on how waves are reflected off surfaces.
• What is the simple 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?

  Begin with the boundary between the two materials.
• What does the normal line represent in a ray diagram?

  The normal is a dashed line that is perpendicular to the surface.
• If the angle of incidence is 45 degrees, what is the angle of reflection?

  45 degrees
• 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
  • Does not produce a clear image
• Why can't you see your reflection in a piece of paper?

  Because paper has a rough surface that causes diffuse reflection.
• How does the surface of a rough material affect reflection?

  The rough surface causes normals to point in different directions, scattering reflected rays.
• What is the key principle that applies to both specular and diffuse reflection?

  The angle of incidence is always equal to the angle of reflection.
• What happens to the reflected rays in diffuse reflection?

  They get scattered in different directions.
• What is the final message of the video?

  Hope you found it useful and to tell friends and teachers about it.