Reflection

• What is the angle of incidence in relation to the normal?

  The angle of incidence is the angle between the incoming wave and the normal.
• What is the angle of reflection?

  The angle of reflection is the angle between the reflected wave and the normal.
• What is the normal in the context of wave reflection?

  The normal is an imaginary line that is perpendicular to the surface at the point of incidence.
• What is total internal reflection?

  • A wave hitting a surface can experience total internal reflection.
  • This occurs when the wave travels through a dense material towards a less dense material.
  • It happens when the angle of incidence is larger than the critical angle.
• Under what conditions does total internal reflection occur?

  Total internal reflection occurs when a wave travels from a dense material to a less dense material and the angle of incidence is larger than the critical angle.
• What happens if the angle of incidence is larger than the critical angle?

  If the angle of incidence is larger than the critical angle, no light comes out as it is all internally reflected.
• What happens if the angle of incidence is less than the critical angle?

  If the angle of incidence is less than the critical angle, most of the light is refracted into the outer layer, but some is internally reflected.
• What occurs when the angle of incidence is equal to the critical angle?

  When the angle of incidence is equal to the critical angle, the wave travels along the surface with quite a bit of internal reflection.
• What are the key concepts related to total internal reflection?

  • Angle of incidence
  • Critical angle
  • Dense material to less dense material transition
  • Internal reflection vs. refraction