Required Practical 9:Reflection and Refraction (T)

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

  Reflection and refraction of light
• Why is it important to learn the details of this practical?

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

  • Ray box
  • Lens
  • Slit
• What does a ray box produce?

  A novel ray of light
• Why should the ray box be switched off when not in use?

  Because it gets hot
• What is a safer alternative to using a ray box?

  Using a laser
• What is the first step in the practical investigation?

  Draw a straight line on A3 paper
• What do you label the line drawn at right angles?

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

  Near the center of the block
• What should you do after placing the glass block?

  Turn off all the lights in the room
• What is the incident ray?

  The ray hitting the block at the normal
• What is the angle of incidence?

  The angle between the incident ray and the normal
• What happens when the angle of incidence is adjusted?

  A reflected ray can be seen
• What do you mark the paths of the incident and reflected rays with?

  Crosses
• What do you do after marking the rays?

  Turn on the room lights
• What should you draw after removing the glass block?

  The paths of the incident and reflected rays
• What angles do you measure in the experiment?

  Angle of incidence, reflection, and refraction
• What is the angle of refraction?

  The angle between the normal and transmitted ray
• What should you do after measuring the angles?

  Repeat the experiment with a different material
• How do the angles of incidence and reflection compare for glass and perspex?

  They are the same for both materials
• What should students expect in the vision workbook related to this practical?

  • Plenty of questions on the practical
• Why does the angle of refraction differ between materials?

  It depends on the material's properties