Light

• What is the first step of the practical?

  Draw a straight line and a normal line
• Why is the normal line important in this practical?

  It helps measure angles accurately
• Where should the block be placed in the practical?

  Along the main line
• What should be marked with crosses during the practical?

  Incoming and outgoing rays of light
• What should be done after marking the rays?

  Turn on the lights and measure angles
• What angles should be measured in the experiment?

  Angles of incidence, reflection, and refraction
• How should the angles be measured?

  Using a protractor
• What is the angle of incidence?

  Angle between the incident ray and the normal
• What is the angle of reflection?

  Angle between the reflected ray and the normal
• What is the definition of the normal?

  A line perpendicular to the surface
• How do you draw the refracted ray?

  Connect entry and exit points with a line
• What does theory suggest about the angle of refraction?

  It varies with different materials' refractive index
• What does theory suggest about the angle of incidence and reflection?

  They should be equal