Reflection and Refraction

• What should you be able to describe by the end of the video on investigating light?

  How to investigate the reflection and refraction of light by different surfaces and substances
• Why is it important to learn the details of the practical investigation of light?


  Because it is a required practical for triple physics students
• What equipment is used in the practical investigation of reflection and refraction?

  • Ray box
  • Lens
  • Slit
• What safety precaution should be taken when using a ray box?


  Switch it off when not in use to prevent overheating
• What is the purpose of drawing a straight line down the center of the A3 paper?


  To serve as a reference line for the experiment
• What do you label the line drawn at right angles to the center line?

  The normal
• Where should the glass block be placed in relation to the normal line?


  So that the normal is near the center of the block
• What happens to the light ray when it hits the glass block at the normal?


  It becomes the incident ray
• What is the angle between the incident ray and the normal called?


  The angle of incidence
• What do you observe when the angle of incidence is adjusted?


  You can see a ray reflecting from the surface and another ray transmitted through the block
• How do you mark the paths of the rays in the experiment?

  With crosses for the incident and reflected rays, and a line for the transmitted ray
• What should you do after marking the paths of the rays?


  Turn on the room lights and switch off the ray box
• What angles do you measure in the experiment?

  The angle of incidence, angle of reflection, and angle of refraction
• How does the angle of incidence and reflection behave with different materials like glass and perspex?


  The angles of incidence and reflection are the same for both materials
• What differs when measuring the angle of refraction between glass and perspex?


  The angle of refraction will be different for different materials
• What should you remember about the required practical on reflection and refraction?


  • It is essential for triple physics students
  • Questions will be found in the vision workbook